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Pilot light won't ignite, gas company came out, got gas

House fan works, thermostat will run the fan, the blower in the unit won't turn on, pilot light won't work. Rheem. 2.5years old.circuit breaker is on.

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  • popatop6598 Mar 11, 2009

    I have a Rheem that is over 5 yrs old ,when pilot light(glow plug) was working,the heater would turn on and quickly shut off at times. Now the glow plug wont work at all,but blowers seem to be working.

  • dwkcool May 11, 2010

    does the exaust blower start if it does check the presure switch ,that is the round peice with the rubber hose going to it with the two wire

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The glow plug or thermocopler is bad

Posted on Jan 03, 2009

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I have a Brivis Buffalo 85, pilot light is on main burners will not ignite when turned on? It seems like gas isnt allowed to bar which turns on main burners


Usually a thermocouple or similar device is employed to allow fuel to flow once the unit sees that there is sufficient heat to ignite the fuel. Otherwise it can be a fuel valve that "sees" an unusual flow of gas which sets off the safety.

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Switch on wall fireplace with Honeywell control SV9403, pilot does not turn on even there is current flowing into the controller device.


Good Evening. Your fireplace is equipped with a smart valve (SV) to which the valve itself acts as the control. This unit has intermittent pilot or hot surface ignition. Can you clarify to me which ignition this unit has?

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Pilot lights up but would not fire up into heating, I have brivis buffalo 85


This is the proper cycle of a furnace and what should happen.

Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.

If the pilot turns on and the gas ignites, then shortly after the unit shuts off, chances are this is your blower motor. It is not starting up, then the heat limit is reached in your unit and the safety shuts it off.

Mar 02, 2011 | Honeywell Programmable Thermostat Heater

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The fan will blow but not in heat mode. The gas heater sounds like it wants to work but there is no heat.


Hello my name is Heath it will be my pleasure to assist you. The problem is probably with the ignition. Check the pilot if its a standing pilot or the hot surface ignitor if it has a HSI ignition If you ohm the hotsurface ignitor and it doesn't show resistance the HSI is shot. If its a standing pilot try lighting the pilot if it lites and doesn't stay lit then the thermocouple could be bad its the rod that sits in the pilot flame easily replaced with a universal replacement that can be found at most hardware stores.

Apr 25, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace cuts off before reaching set temp.


You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Mar 07, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell thermostat TH6110D1021. Blower comes on


Hi, You are right, fan is on a time delay in the heating cycle, and after burners fire that is when this delay comes into play. You have a preset factory temperature that determines the cycle on time for the fan, and the off time after the burners shut down also. This will not be in the thermostat, but in the fan/limit control the is mounted on the face of the furnace, with a probe inserted into the fire box.Depending on how old or new this unit is, will depend on the type control you have.It may be just a high limit switch, or the 1st I mentioned.If so, It rotates in the burner as the temperature rises, to turn the fan on and off.Disconnect power, remove cover, and 2 screws.Slowly remove the control and gently clean the probe. Turn the dial if this one has it and you will be able to hear it click. This click is contacts closing to start fan operation.Reinsert and try again. If problem continues, you will have to replace it.They do tend to stick closed/on, in the heat cycle from time to time and a cleaning sometimes will solve this problem. Not knowing how old this furnace is and type, make it difficult to give you a correct diagnosis, so check this fan control as I have explained, and if your system is of a different type, please let me no so I can correct this problem. Sincerely,
Shastalaker7

Dec 11, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

My gas house heater turns on, but turns off in a couple minutes. The heat never starts to blow out. Do you know what the probem may be. The piolot light is light and I just replaced to batteries on the...


It could be a few things, dirty pilot assembly, dirty or bad flame sensor or a bad gas valve or loose wire on the gas valve. Watch the flame as it lights to see if all the burners light. If not you will need to clean the burners and flame tray that spreads the flame to all burners. Good luck!

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1 Answer

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make sure that the thermocouple is staying in the flame youmay want to replace it unless it is staing lit on its own until knob is turned if so gas valve bad

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The clicking noise is a relay or switch of some sort. You are right about that. I have 2 questions. 1) does the thermostat have a mercury bulb in it? 2) when the fan shuts off and on, does the burner stay on?

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