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My heater is not working reliably. With the setpoint above the room temp, it may come on right away, or not for 12 hours. Pilot/igniter is ok, and will sometimes start the furnace heat going, then shuts off. New digital Honeywell thermostat, worked fine until 3 weeks ago. Thermostat says Heat when it's trying to turn on the furnace, but often nothing. Sometimes when it's starting up a loud buzzing sound comes from the furnace, perhaps a relay oscillating.

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Could be an open or stuck limit switch, not really a good thing.

Posted on Feb 01, 2010

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Have a new richmond water heater.there was no hotwater.i checked the water heater pilot was not lit.i relight it, it lite.turn to temp settings pilot went out.relit it againmade a explosion bom sound


the explosion was from a build up of gas that was not properly ignited by the pilot light or was leaking into the combustion box when there was no pilot light
there is a serious problem in the gas control system that needs urgent professional assistance to fix
you were lucky as it could have blown you out of the room
get in an experienced gas fitter as it is not a diy job

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Gas furnace not turning on pilot is lit Bryant


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You need to inspect and clean the air intake located on bottom of unit. Get more fresh air to the water heater and see if problem continues.
http://waterheatertimer.org/images/Flame-trap-inspection-325.jpg
http://waterheatertimer.org/images/State-select-air-intake-400.jpg

Instructions for lighting the unit are located on front of water heater.
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Hows the pilot flame looking, is it nice and blue. The pilot flame on some of these units has was called oxygen depletion safeguards. It's to shut the unit down if the oxygen level in the room gets low. In practice it means the pilot light has to be perfect. I always like to recommend getting these units serviced regularily.

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sounds like your pilot saftey is working.the pilot flame heats a device called a thermacoupler which gives a signal to the gas valve letting it know its ok to open main valve. you may need a new thermacouple , might have a dirty pilot orfice or a problem with gas pressure or worse case a cracked heat exchanger in any case in less you have some type of training you should call a pro

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