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Gas heating system GUH-92A burner shuts off bfore reaching temp. setting

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  • Heating & Co... Master
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Check the thermostat operation.

Posted on Dec 21, 2016

Testimonial: "brand new install,complete sys. When blower starts,gas valve shuts off,on,off sometimes 0sec.,10sec.30sec,60sec. flame sens.good, no change in flame,not a flicker,till valve shut off"

  • Duane Hughes
    Duane Hughes Dec 21, 2016

    Has outside ex. and in. straight up out roof

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When I turn the oven down the gas goes off and have to start again


read the user manual as the temp should be thermostat controlled were with gas there is always a pilot light burning when the oven is in use and when the set temp is reached the gas burner is shut off and when the temp fall below set point , the gas is turned on again and the pilot light starts the burner
by using the timer , when the time is reached the gas is turned off and of course you will have to relight it
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I install 2 new honeywell non programmable thermostats. The temp never reaches the setting temp. Always 5 to 8 degrees off. I can not get the furnace to heat the home over 70 degrees. Even set at 80. Any...


If the furnace is cycling on and off and not reaching temp there is a problem in the control circuit. If the thermostat is not satisfied the furnace should be running without shutting off in which case the capacity of the furnace is inadequate because of size or problems reducing the capacity. This could be caused by an increase in home size, poor air flow (dirty filter, loose fan belts, fan running slow, obstructions in the duct), dirty heat exchanger or burner, reduced gas flow, over temperature switch bad causing the burner to shut off early, or a few more technical reasons. You may do well to call a technician to troubleshoot this problem.

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Pilot and burner light then gas shut off model 7900


How many degrees before it reaches desired temp, does it shut off? A thermostat is designed to shut the furnace off a couple/ few degrees before it reaches set temp. It has what is called a heat anticipater, which shuts the burner down, and lets the blower use the remaining heat from the heat exchanger to bring it up to desired temp making it more efficient. If it is more than a few degrees, replace the thermostat. You can jump out the red and white wires to confirm the faulty thermostat. If by doing this, the furnace never shuts down, until you separate the red and white wires. That confirms a faulty thermostat. Hope this helps someone.

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Check out the flame sensor see if it is clean and check the connections .

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If you have a volt meter check the IND connection on the Fenwal for 24volts while running and keep your meter on it until it shuts down. If the power is still present at the IND while shutting down then it would appear to be a Fenwal problem. It sounds like the temp circuit on the board or the temp sensor it self is bad. Try dipping the temp sensor in a glass of water with a confirmed temp to see if it is accurate.

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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).

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the gas orifices may be plugged try to poke them out with a fine wire . shyt off power and gas before cleaning as you don't want to be burned

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1 Answer

Viking oven only one burner will light


http://www.vikingrange.com/MEDIA_CustomProductCatalog/m20127_f20254.pdf
Go to this web site. It has a manual on Viking ovens.
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