Question about Heating & Cooling
I have a Janitrol GUPS075-3 furnace (but the circuits match the wiring diagram for a GUPI model in my book). Induced Draft fan turns on, pilot lights, main blower turns on, main burners ignite and burn for 5 seconds then shut off. Pilot remains lit and the pilot ignitor keeps sparking continuously for several minutes with the pilot flame lit. Then eventually the ingitor turns off and pilot goes out. Main blower shuts off after a while. Induced draft fan keeps running all the time no matter what. Whole cycle repeats indefinitely every 5+ minutes. I can get the burners to stay lit if I grip the main valve with my hand and hold onto it while the cycle starts. Any ideas?
The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.
Posted on Nov 08, 2012
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Posted on Jan 02, 2017
SOURCE: pilot lights but no main burner
Is there a way to check for gas pressure even if just a slight loosened connection to hear it then quickly re-tightened. Otherwise the main valve is not working as it should and will need to be serviced or replaced. Thats all i got.
Posted on Dec 07, 2011
Turn off the power to furnace.
on the last burner to light there is a small metal rod in front of the burner. This is a safety called the flame sensor. It is dirty. Unscrew it from the bar ( 1 Screw) unplug the connector wire from it and clean it with steel wool. it will be kind of burnt. Plut back in place and turn on the furnace to cycle.
Posted on Apr 04, 2010
SOURCE: I have a 90+ gas
What you are describing would seem to indicate that the high limit switch tripped....
Check to see if there is a manual reset high limit in that heater...also recycle the power at hte circuit breaker to reset it from a lockout to see if the high limit is an auto reset...
If none of that works then the high limit may be bad or the circuit board is bad...
Posted on Nov 25, 2010
I'm having the same exact problem... At first we thought was the vent... but the way the flames goes out... it seems that there is "not enough oxygen" more than "blown out by the wind"... right after both main & pilot goes out, I can't even light any external flame inside the chamber... and it doesn't feel like the outside cold air coming in... it just feel like there is some sort of gas in the chamber that's so strong, it prevents flame... and the only thing I can think of is that it doesn't have enough oxygen, but too much natural gas, and flame can't sustain.
Posted on Dec 16, 2010
Hello, sounds like the limit switch is opening on the furnace.Usually when a furnace goes off on its high limit is becuase the airflow is being restricted making the furnace overheat. a limit switch is there to protect the furnaace from overheating, most cuases are either dirt or the blower motor not running up to speed, anything that cuts down on the airflow will cause the high limt switch to open.
Posted on Feb 24, 2011
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