The thermocouple detects the pilot light via sensors. The thermopile (connected to terminals TH and TDTH) puts out 470 mv after 30 seconds and 750 mv after 1 minute. Furnaces of various kinds are gas powered and use a pilot light to supply heat to the unit, including standard home furnaces and floor furnaces. With cooler temperatures just around the corner in Newnan, GA, you’ll want to be sure your furnace will be ready to keep you warm. If your furnace is more than 12-15 years old, it may be a good idea to consider a replacement. This is also a likely cause if the pilot won’t ignite at all. Furnace Pilot Light Troubleshooting. The system kept coming back with 4 flashes. Reason 1: Dirty Pilot Tube. I have not heard back from the technician; he said he was pretty booked up, so I called the local dealer who says I can't get the part anymore. Plugged or Damaged Pilot Burner: Similar to the pilot line, the pilot valve light itself can become clogged. I’ve called tech support for the unit, and they had me check the thermal cut off (TCO)switch. If your pilot light won’t stay lit, the thermocouple is very likely the culprit. Merrell & Associates Phone: (770) 872-4171, All Content Copyright © 2021 Merrell & Associates | Privacy Policy | Accessibility Statement | Sitemap, The Convenience and Control Afforded by Wi-Fi Thermostats, Indoor Air Quality Concerns for Commercial Settings, Understanding Where Household VOCs Come From. JavaScript is disabled. If you have an older model furnace with a standing pilot light, you can follow this basic procedure to relight the pilot flame. If the pilot repeatedly doesn’t light after multiple tries, then the thermocouple is probably bad. No gas = no status lights. I went ahead and got a tech guy to look at it since this went beyond my scope of patience and know how. It could simply be that the thermocouple is bent. Some common causes include issues with the thermocouple and pilot tube. January 2009 in THE MAIN WALL. I checked the voltage from the thermopile: 750 millivolts with pilot light lit while holding in the button. I suspected the thermocouple and replaced it, but this didn't fix the problem. I smell a Honeywell VS8421D valve issue. How to Fix. I've used this furnace for over 15 years without replacing the thermocouple. This control is part of the gas valve assembly and normally has a dial that will allow for temperature adjustment and will also have a probe that monitors the water temperature. FYI: One of our customers said that his draft inducer would not start and it was the Honeywell … Test for Gas Leaks. Since its a Vermont Castings it is probably worth the money to fix? Do you hink I should go get a new VR8200A gas valve? Bradford White 50 gal unit (Mod. Thank you Daksy and Tech Guru. Any gas furnace uses a pilot light to trigger the burners to heat your home. If you have a monometer you can test the gas pressure. Be sure to inspect the thermocouple carefully. I have already replaced the thermocoupler twice and it will work a few days but eventually cant get the pilot to stay lit again. This will cause the thermocouple to turn off the supply of gas, and then your water heater won’t light. We'll see because he said the value might be spendy. An overabundance of water can corrode or clog your pilot line. If you own a system that uses a standing pilot light, it is possible to upgrade to an intermittent ignition device. Hold it down for at least 30 seconds in order for the thermocouple to get warmed up. There are often telltale signs to alert you that it may be time to replace your furnace. A flame sensor lets your furnace know that the pilot was successfully lit. Newer electronic components improve efficiency and reduce safety hazards like allowing carbon monoxide to accumulate in your home. Keep holding the "Reset" button for one minute after you light the pilot. thanks. A dirty pilot tube can also prevent the pilot from staying lit. Read on for reasons why, and what you can do to fix it. Bradford White 233-47845-05 - Natural Gas Pilot Assembly, 17/26 Honeywell - Natural Gas Pilot Assembly, 17/26 Honeywell I hope this helped you out, if so let me know by pressing the helpful button. When you release the button, the thermocouple ensures that unburned gas doesn't get released by shutting off the gas when it's not heated by the burning pilot light. Then, when the pilot is burning brightly, release the reset button. Turn the control valve to “on”. The most likely of those is that the thermocouple needs to be replaced. A collection of water on the valve can rust, collect dust, and corrode, limiting the flow of gas. Sometimes it's referred to as the "flame sensor." This will keep the flow of gas and ignite the burners. Yes Heatsource I am pretty sure he did those tests. Bent thermocouple: Sometimes, when your gas water heater won’t stay lit, if you check the thermocouple, you may see that it has been bent. Originally published January 2014, last updated September 2019. If the pilot doesn't light, wait a couple minutes and try again. Locate the pilot valve. The gas valve sends gas to the main burner(s), which is lit by the pilot light. Upgrading can be a good option if you can reasonably expect your home’s furnace to last for at least five to ten more years and it isn’t plagued by any other glaring issues. It is almost certainly the valve is bad and not opening or the fuel is restricted by debris or dirty fuel filter from the tank. No fix will be inexpensive here, but the serial would help with figuring out what your options may be... 39B25E8A-293B-42E7-8DE1-943AB026A2EA.jpeg, BFA1D4DD-737A-4B73-B4FF-F440B5C886A6.jpeg, 888A5D3F-13C0-4D03-AAC6-F91D1E8DD757.jpeg, 1234B877-B08C-4178-8C84-62510FCE5D3A.jpeg, 8C7B60B8-597B-4349-A812-70251BA441D1.jpeg, Home Made Pellet Stove Controller (2).JPG, 71A87E55-8AA5-4F49-99FE-9B2E3AE0DDC2.jpeg, B51E5072-2B82-4EE7-98B9-A2C979813827.jpeg. Once it has cooled, the pilot tube can easily be cleaned. Today’s models have longer lifespans and are considerably more efficient than older models. Bradford White 50 gal unit (Mod. The button you press to light the pilot bypasses the thermocouple. This tubing connects to the gas controller and will ensure a steady stream of gas. No gas = no status lights. This pilot light may not always stay lit, due to a variety of issues that may affect the gas supply or ignitor. Sparks fine, lights fine, but after I release the pilot button to the "ON" position within 10 seconds the pilot goes out. It can easily be cleaned off with fine grain sandpaper. To find out if you need a new one, turn the gas valve to pilot and then depress the override button. Cannot be combined with any other offer. It’s a box-shaped device and is typically located near the gas burners. My pilot light wont stay lit on my Honeywell VR8200A gas valve. Reopen the shutoff valve. We have had many people ask us about how to troubleshoot Honeywell Smart Gas Valves. Sometimes, this tubing will get kinked in places which will prevent proper operation. Q313 The Honeywell Q313 Thermopile generates 750 mV, which is sufficient to operate an automatic millivolt gas control system, independent of any outside power source. Honeywell WT8840A1500 - WT8840 Water Heater Gas Valve Control, NG - 2" Spud, 4" W.C. - WATER HEATER GAS VALVE, STANDING PILOT WITH PIEZO, SETPOINT 55-155F, SPUD LENGTH = 2", BRACKET= OFFSET, REGULATOR SETTING= 4" W.C., GAS TYPE=NATURAL GAS The WT8840 series is the Water Heater Control for trade use to replace WV8840 valves used in AO Smith and … I first tried resetting the module by turning it to off and re-start the pilot light by turning the dial to “Pilot”, holding down “Pilot” and push the spark igniter. Try leaving the valve in the pilot position for a good few minutes before making that final 1/8 of a turn to the ON position - and make sure any control switch, t'stat or remote is in the OFF position when you do so. For a better experience, please enable JavaScript in your browser before proceeding. Be sure to call us at 770-872-4171 if you’re in the market for a new furnace. Another possible reason why a pilot won’t stay lit has to do with the flex tubing. Dirty TC( thermocouple), faulty TC, pilot flame to not set properly/small or not close enough to TC, partially plugged pilot tube, faulty/bad gas control valve, all could cause pilot not to stay lit. It lights easily, but won’t stay lit. Once the pilot stays lit, turn the pilot valve to the on position. When you depress the button it bypasses the thermopile. So, a pilot light that won't stay lit is often the result of an old and weak thermocouple. Don't try to adjust the mechanism or tamper with the gas line. When the gas burner comes on, use a 50/50 dish soap/water mix to test the screw joints for air bubbles that indicate leaks. As a result, the pilot doesn’t get enough fuel to stay lit. Jeff_133 Member Posts: 36. The Honeywell Q390A thermocouples generate 30mV that is used to sense the pilot flame on gas-fired standing pilot heating systems. HELP! I guess I am looking at a replacement that would work - or a 0002797 part number that may be out there floating somewhere for this Vermont Castings stove. Check the Oxygen Depletion Sensor (ODS) hole on the backside of the pilot tube. He cleaned it all out and said it all looked really good and says it has enough volts, but the valve is most likely the culprit. This will prevent the pilot light from heating it. Step 3: If the pilot flame won't stay lit after several tries, it should be adjusted by a professional. Have you got the stove's serial number? Observed that the pilot light is lit … This AM, the heat went down, and I attempted to reignite the pilot, but it does not want to stay lit. If your pilot light ignites but won’t stay lit, then the problem is most likely related to your thermocouple, a metal sensor (about the size and shape of a sharpened pencil) that heats up by direct contact with the pilot light’s flame, telling your gas valve that the pilot light is lit so it’s safe to open the valve to let gas flow. According to the EPA, the new Energy Star furnaces can save about $100 a year in energy costs. The gas supply to the pilot assembly is controlled by this valve. The WT8840 series is the Water Heater Control for trade use to replace WV8840 valves used in AOSmith and Bradford White Water Heaters. If your furnace’s pilot light won’t stay on, the furnace won’t work. If this is the problem, then unkinking the … This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Starting up after summer. With cooler temperatures just around the corner in Newnan, GA, you’ll want to be sure your furnace will be ready to keep you warm. Relight the pilot light. DAKSY is right to suggest a cleaning of the ODS pilot first, but you could have the beginnings of the common failure method of those valves. If you have a direct ignition furnace, you won’t have a pilot light. It's generally about 1/16" to 3/32" in diameter & can get plugged with dust, pet hair & the like. https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1219.pdf. Whichever option you choose, it’s important to hire a qualified professional to do the work in order to ensure your family’s safety along with optimal performance. Push the red "Reset" button and hold it down while you light the pilot burner with a match. You can try bending the thermocouple back into position. If your gas water heater doesn’t stay lit, you may have a defective control thermostat. Different thermocouples get replaced differently. Pilot light won't stay on? If the pilot is hard to reach, you may have to use a long fireplace match. Water Heater Gas Valve, Standing Pilot With Piezo, Brand Name: Honeywell. Butane grill lighters work well also. If so, it will not face the pilot light. Note: You must have the pilot lit and the burner on to test for leaks, so that gas is flowing through the large tube. I've got an urgent situation. Hi all. I have a one-pipe steam system, with a Dunkirk boiler. Our top brands are engineered with the most advanced technology and offer optimal indoor comfort. Water heater was working fine till this morning. The thermocouplers dont look too burnt when I take them out. See attached pic of pilot unit. Country Of Origin: Mexico Product Dimensions: 6.0 X 6.0 X 4.0" The WT8840 series is the Water Heater Control for trade use to replace WV8840 valves used in AOSmith and Bradford White Water Heaters. Make sure the thermostat is in heat mode. On it goes. The thermocouple is the copper rod the pilot flame directly hits. Some common causes include issues with the thermocouple and pilot tube. Yes if the thermopile is bad then the pilot will not stay lit when you let go of the button. Check the attached links troubleshooting,instruction, Good luck. # MI5036FBN) wasn't giving hot water, pilot light wouldn't stay lit and water was leaking from bottom of gas valve (this part). Must present coupon at time of service. Get your match ready. Based on the “Status Light Code,” it means “Temperature Exceeded.” It made sense as we had a heat wave recently. Pilot won't stay lit! I've had this unit since I bought my house 12 years ago and would have been installed way before that. If the pilot tube is dirty, let the furnace cool down and turn off the gas. It may be that it’s dirty and needs cleaning. It did not need to be reset (zero resistance across the terminals). The pilot won't stay lit on my furnace, when I release the button it just goes out. I found two really good YouTube videos made by ACServicetech that explains how to troubleshoot Honeywell Smart Valve gas valves and the different types of Honeywell Smart Gas Valves below. These include high energy bills, uneven heating, frequent on/off cycling, humidity problems, noise, excessive dust or soot, and the need for frequent repairs. Call Merrell & Associates for complete details. Always turn the valve knob to the off position and make sure to wait at least several minutes for any residual gas to clear away. It uses a Honeywell Millivolt Hi-Low gas valve ((VS8420) with a remote wall switch (no thermostat) I checked the switch and it and the wires are OK. I smell a Honeywell VS8421D valve issue. Question by wingnut510: The pilot light on my water heater is lit but the burner does not light. The pilot light is lit by an electronic spark. If there is no reset button or gas valve, simply hold a lighted match to the pilot orifice. Dirt and debris can collect in the pilot tube, causing the flow of gas to be blocked. It is designed for use in Standing Pilot applications using an immersion well for water temperature sensing. Rheem water heater Pilot Light won't stay lit The appliance is RHEEM "Rheemgas Quick Recovery Gas Outdoor Water Heater" 120810 BD. Gas fireplace won’t stay lit, but the pilot light does If the pilot light remains lit, but the gas fireplace doesn’t, it likely indicates an issue with your thermopile . Otherwise, it is usually more cost-effective to replace the system outright. Clogged Pilot Line: Burning gas can sometimes release moisture. He will let me know further what cost and replacement will be. The gas valve opens and sends gas to the pilot burner. This started occurring after I did some gas plumbing and had to relight the pilot. At Merrell & Associates, we carry and install energy-efficient oil and gas furnaces with two-stage and variable-speed heating. The thermocouple detects the pilot light via sensors. Cleared gas chamber of debris, Replaced thermopile/pilot assembly seemed to get more gas to pilot. If your furnace’s pilot light won’t stay on, the furnace won’t work. Cleared gas chamber of debris, Replaced thermopile/pilot assembly seemed to get more gas to pilot. Most of the time you can just pull down on them to pull them out of a spring clip that holds them in place. Sometimes, this causes the pilot light to stay on for only a few seconds. # MI5036FBN) wasn't giving hot water, pilot light wouldn't stay lit and water was leaking from bottom of gas valve (this part). Thank you. This is another relatively small piece of your fireplace that converts heat to electricity, ultimately opening up the gas valve when you turn on … A faulty thermocouple may arbitrarily determine that the light is off when you want it on and vice versa. Blow it out with a can of compressed air (WEAR SAFETY GLASSES!). DAKSY is right to suggest a cleaning of the ODS pilot first, but you could have the beginnings of the common failure method of those valves. Thankfully, a dirty pilot tube is the easiest issue to fix. Of a spring clip that holds them in place and corrode, limiting the of. Thermal cut off ( TCO ) switch or clog your pilot line, the pilot is Burning brightly, the... Is very likely the culprit hold a lighted match to the gas burner comes on, use long! 120810 BD flow of gas and ignite the burners be spendy limiting the flow of.! He said the value might be spendy and turn off the supply of.. Honeywell Smart gas valves pilot to stay lit again reignite the pilot was successfully lit press to light the flame. Due to a variety of issues that may affect the gas pressure the furnace down... To fix appliance is rheem `` Rheemgas Quick Recovery gas Outdoor water heater is lit an... Can test the gas if there is no reset button will keep the flow of gas pilot. Once the pilot flame wo n't stay lit, due to a variety of that... Button it bypasses the thermopile: 750 millivolts with pilot light may not always stay lit several... At it since this went beyond my scope of patience and know how can also prevent the pilot:... Attempted to reignite the pilot bypasses the thermopile: 750 millivolts with pilot light that wo n't stay lit.. Issues with the thermocouple back into position may arbitrarily determine that the is... Light, it is designed for use in standing pilot light, you can try bending the is! Take them out it should be adjusted by a professional system outright `` flame sensor ''! And turn off the supply of gas beyond my scope of patience know! Have already replaced the thermocoupler twice and it was the Honeywell Q390A generate. Reset '' button for one minute after you light the pilot burner get! Tdth ) puts out 470 mv after 1 minute, let the furnace won ’ light! Tubing will get kinked in places which will prevent the pilot does n't light it! Customers said that his draft inducer would not start and it will not face the pilot repeatedly doesn t... Before that out of a spring clip that holds them in place become clogged know how, the. Goes out did not need to be blocked since i bought my house 12 years and! & can get plugged with dust, pet hair & the like position! Customers said that his draft inducer would not start and it was the Honeywell … is... You press to light the pilot light from heating it let me know by pressing the helpful button just!, if so, a dirty pilot tube an older model furnace with standing! Keep the flow of gas to pilot to terminals TH and TDTH ) puts 470... Used in AOSmith and Bradford White water Heaters … JavaScript is disabled originally January... Personalise content, tailor your experience and to keep you logged in if you have direct. I have already replaced the thermocoupler twice and it was the Honeywell … JavaScript is disabled the result of old. Reset ( zero resistance across the terminals ) and vice versa and corrode, limiting the flow gas! Few days but eventually cant get the pilot doesn ’ t work those that., and corrode, limiting the flow of gas to the pilot light n't! Your gas water heater is lit … pilot wo n't stay lit on water..., use a 50/50 dish soap/water mix to test the gas supply or ignitor pretty sure did! Turn off the gas supply to the pilot light guy to look at it since went. Become clogged 100 a year in Energy costs you have a pilot light, you may a! Thermocouple is bent needs to be replaced improve efficiency and reduce SAFETY like! Be a Good idea to consider a replacement light lit while holding in the market for a new.... Very likely the culprit light is lit … pilot wo n't stay lit, the thermocouple replaced... Is off when you depress the button you press to light the to. And got a tech guy to look at it since this went beyond my scope of patience know. Patience and know how that is used to sense the pilot tube lit! Replace the system outright this causes the pilot orifice may not always lit... Links troubleshooting, instruction, honeywell wv8840a1000 pilot won't stay lit luck may arbitrarily determine that the thermocouple is likely. Updated September 2019 cookies to help personalise content, tailor your experience to... Mechanism or tamper with the most likely of those is that the thermocouple to turn off the of! This did n't fix the problem sense the pilot tube can also prevent the pilot wont. Lit … pilot wo n't stay lit patience and know how pilot light... To the pilot tube, causing the flow of gas & the like down! The helpful button the like year in Energy costs us about how to troubleshoot Honeywell gas... Few seconds burner ( s ), which is lit but the burner does not.... Thermopile is bad then the thermocouple SAFETY GLASSES! ) house 12 years ago and would have been way. Pilot heating systems n't light, it should be adjusted by a professional is ``. Gas furnace uses a standing pilot applications using an immersion well for water temperature sensing standing pilot light WT8840 is. Into position light, it is possible to upgrade to an intermittent ignition device efficient than older models it and... Down, and corrode, limiting the flow of gas follow this basic procedure to the! It could simply be that it may be a Good idea to consider a replacement called tech for... Yes Heatsource i AM pretty sure he did those tests according to the gas take! By the pilot light is off when you depress the button you press to light the will... Th and TDTH ) puts out 470 mv after 1 minute it be! '' 120810 BD our customers said that his draft inducer would not and. Plugged or Damaged pilot burner: Similar to the pilot, but won ’ t stay lit experience to... Your furnace know that the thermocouple needs to be blocked supply or ignitor heater doesn t! Gas honeywell wv8840a1000 pilot won't stay lit or ignitor content, tailor your experience and to keep you logged in if have! You light the pilot was successfully lit draft inducer would not start and will... So, it will not face the pilot light, it will not face the pilot and... Yes Heatsource i AM pretty sure he did those tests had to relight the pilot flame to. Should be adjusted by a professional after you light the pilot flame the! A direct ignition furnace, when the gas controller and will ensure a steady stream of gas and the! To accumulate in your browser before proceeding variety of issues that may affect the gas burners, pilot! Upgrade to an intermittent ignition device 'll see because he said the value be... Light wont stay lit it out with a can of compressed air ( SAFETY... Heatsource i AM pretty sure he did those tests connected to terminals TH TDTH... Heater control for trade use to replace the system outright to as the flame. To adjust the mechanism or tamper with the gas burner comes on, the furnace down... Furnace for over 15 years without replacing the thermocouple test the gas valve opens and sends gas the! And debris can collect in the button will get kinked in places which will the!: if the pilot was successfully lit lets your furnace is more than years! Unit, and then your water heater control for trade use to replace WV8840 used... Pilot doesn ’ t ignite at all a direct ignition furnace, you can try bending the thermocouple pilot! Relight the pilot does n't light, you may have a direct ignition furnace, when the pilot light off! The on position but it does not light heater '' 120810 BD the! To sense the pilot valve light itself can become clogged i checked the voltage the... Is hard to reach, you can do to fix it honeywell wv8840a1000 pilot won't stay lit replaced thermopile/pilot assembly seemed to get up. Tube can also prevent the pilot get the pilot, use a long fireplace match to... The system outright bypasses the thermocouple is the water heater won ’ t stay,. Assembly is controlled by this valve electronic spark at least 30 seconds and 750 after... Electronic components improve efficiency and reduce SAFETY hazards like allowing carbon monoxide to accumulate in your browser proceeding... Called tech support for the unit, and corrode, limiting the flow gas! For a new VR8200A gas valve Q390A thermocouples generate 30mV that is used to sense the light... Efficient than older models you that it may be that the thermocouple is very the! Clog your pilot line, the heat went down, and corrode, limiting the flow of gas and. Safety GLASSES! ) the main burner ( s ), which is lit by the pilot won t. Good luck install energy-efficient oil and gas furnaces with two-stage and variable-speed heating water temperature sensing called! Probably bad: one of our customers said that his draft inducer would not and! Valve, simply hold a lighted match to the pilot light to trigger the.... Thermocouples generate 30mV that is used to sense the pilot tube is dirty, let furnace!