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Why does your gas hot water heater pilot keep going out?
- This is usually caused by a bad thermocouple. The thermocouple looks like a thick, solid copper wire screwed into the gas valve on the water heater. The pilot flame heats the tip of the thermocouple, causing it to generate a minute electrical current at low voltage, which provides power to an electric valve that controls the flow of gas to the main burner. If you attempt to relight the pilot burner and it refuses to stay lit when you release the button on the gas valve a minute, or so, after the flame has been lit, the thermocouple is the most likely cause. Replacement thermocouples are readily available from most hardware stores and can be replaced by the homeowner, using simple tools, by following the instructions on the package.
- Another cause of the problem could be a lack of air to the combustion chamber. Newer water heaters require more volume of air due to the addition of a heat sensitive diode to the thermocouple. Not enough air flowing through the combustion chamber to carry the heat up through the flue causes heat build up, which kills the thermocouple. On my water heater, I could light the pilot and the water heater would burn for 20 minutes or so and shut off. The fix included routing the flue straight through the roof and opening floor to allow more air into the water heater compartment.
- Another possible culprit may be water-heater vent height above the roof. In some situations this may periodically result in a downdraft that could cause the pilot light to go out. If this is the case adding to the vent height may help. Note: building code states that the B vent required height is based on the roof pitch but it must be 2 feet higher than any portion of the building within 8 feet of the vent.
- Make sure the vent cap isn't missing or rusted through on the roof, it will cause drafts and wind to blow out the pilot.
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Answer No because water heaters have a safety valves and when the pilot light goes out the safety valve shuts off the gas
The pilot could be dirty and may be too weak to heat the thermocouple properly. Most of the time it comes down to replacing the thermocouple. ANS 2 The thermocouple costs… less than $19 and can be changed in about 30 minutes. Best to first Shut off gas, and remove your one, then take to the store for comparison. There are 5-6 different types but all very similar. Honeywell Universal is good for many heaters. This is essentially a thin copper tube 18 -30 inches long, with a metal bulb at one end and a hollow nut at the regulator end. Many good instructions on internet about how to do it
If you mean that a gas hot water heater (HWH) has the flame go out (located beneath the HWH tank.) Then this is the normal operation whenever the temperature reaches the set p…oint. You can regulate this temperature by adjusting the control, on the HWH. (hint: Be careful when raising the temperature, increase it slowly over a few days as the shower temp. may surprise someone in your home.) If it continues to shut off too frequently, you may have a gas or HWH regulator related problem, in that case call a professional. This explanation does not apply to electric or oil fired HWH's.
Depress pilot valve, hold in while lighting, hold in for 2 minutes while lit. Continue to hold pilot valve in while rotating the gas control to the "on" position. If the pilot… flame doesn't stay lit, it may be due to a bad thermocouple, a device that looks like a thick, solid copper wire whose tip is in the pilot flame and whose other end is screwed into the gas valve. You would need to get a replacement thermocouple from a hardware store or have a handyman install a replacement thermocouple for you. Thermocouples typically last 6-8 years if the pilot flame burns continuously.
The detailed directions are printed on front of EVERY gas regulator. - However, in general, turn regulator switch to OFF for 2 minutes, then to PILOT and depress for one minut…e, then light pilot or press clicker till it lights. Keep PILOT pressed for 2 more minutes then slowly release it. If it stays on then turn main switch to RUN or ON. (if the pilot has to be lit manually, I use a barbecue match, 12 " long.)
The thermocouple is going bad. The thermocouple is the small tube that sits in the flame from the pilot light and goes back to the gas valve. They are easy to replace and cost… $6 to $8. For health and safety the failing part should be replaced without delay by a competent gas engineer.
There are a few possibilities. One is that the water heater is not large enough for the demand put on it. Another is that it is not turned up high enough. Another is that your… shower and bath valves are preset so as limit that maximum temperature. These can be adjusted and how to do it is dependent on the type of valve. Typically you have to remove the shower valve trim to get to the adjustment screws. Some Delta brand single-control pressure-balancing valves have a stop disc hidden under the control handle that can be rotated left or right in fixed increments to set the maximum temperature. Another reason is calcium buildup at the bottom of the water heater which impedes its ability to heat water efficiently. This can be mitigated by opening the valve at the bottom of the heater and shutting off the hot water outlet valve on the top. I like to drain it a bit and then turn on and off the cold water supply to surge and lift the sediments off the bottom so they will make their way out the hose bib at the bottom of the heater. If you have very hard water in your area, the tank may require deliming after a few years of use. Remove the hot water fitting at the top and drain out half the water. Pour de-liming granules (a weak acid) into the hot water outlet with the aid of a funnel and turn the temperature of the heater up to its highest setting for an hour, or so. Turn the heat off and let the hot acid solution work for a while, then drain the tank, reconnect the hot water fitting and flush it out thoroughly via the drain valve before setting the thermostat to the normal temperature and returning the tank to service. Deliming granules are available from many hardware stores. You might consider replacing hot water tank with a tankless water heater. It pays for itself in a few years, but will require a dedicated circuit, if electric, or upgraded supply pipe, if gas. Tankless heaters also have a tendency not to turn on at low flow rates, thus providing no hot water at all, and giving up a water tank is also loss of an emergency potable water supply in case of a natural disaster.
try changing the "thermocoupler"( not sure of the spelling) The piolit light heats the thermocoupler. looks like a little metal rod that sits above or right next to the piolit… light. when the thermocoupler is heated it produces a millivolt of electricity the power it produces is what keeps the gas vaulve open. this is a safety feature, if the piolit light goes out the gas will shut off so that the house does not fill with gas. This is why when you light the piolit you must manually hold the button in until the thermocoupler heats up. Gas appliances should only be worked on by licienced pros, don't risk the lives in your house in order to save a few bucks
You need a qualified tradesman
Answer 1 (1) the gas is cut off; (2)the pilot light blew out and is not igniting the burner; (3)the thermostat is set too low for your requirements; …(3)the thermocoupler is bad; (4)the pressure relief valve is stuck in the open position and discharging the hot water. 1,2,& 3 are self-explanatory. The thermocoupler is a bullet-shaped sensor located near the burner - it senses the temperature and turns the gas on or off to the burner according to the setting of the thermostat. The pressure relief valve is usually located at the top of the water heater on the hot water line and leads to the floor and under the house (separate from regular service hot water line) - it opens when the temperature of the water is too hot and discharges the hot water to keep the heater tank from over-heating and exploding. Hope this helps. Answer 2, One Correction Answer one is very good, but there is one error which requires correction. The thermocouple does NOT, as described in answer one, act as a demand thermostat for turning the main burner gas ON and OFF. The demand thermostat probe extends from the back of the gas control valve INTO the water INSIDE the heater tank. On the other hand, the thermocouple is located so as to be IN THE PILOT FLAME. Its purpose is to determine the presense of the pilot flame, and if the pilot flame goes out, the thermocouple will cool down, at which time, it TURNS OFF the gas TO THE PILOT. This is a safety feature designed to prevent the continued release of gas, which which if gaining contact with an open flame or any spark, would result in a devastating explosion.j3h.
Why does your gas water heater flame go out as soon as it lights. My pilot stays lit. Is this a bad T-Stat or gas valve?
sounds like you have a bad thermocouple. The thermocouple senses the pilot flame and produces voltage to tell main flame to light. Thermocouple can be bought at any hardware s…tore.
No, that is part of the function of the pilot light. To light the burner and to keep the gas valve open. The thermocouple sits in the flame of the pilot and produces a small e…lectrical current that keep the gas valve open. When the tank cools down, the thermostat opens the valve to the burner so that it can light. When the pilot goes out, it is usually the thermocouple that is bad.
sounds like may be to much heat. if its coming out of the pressure relief valve located on top.turn heat down, you said coming out the valve i thinking you mean the valve on t…op of heater.if so thats it. faulty valve or water is getting to hot.hope thathelps