Re: GMP075-3 intermittantly will run then shut off and...
The led is flashing your fault code. You can look the code up by looking on the inside of your indoor blower panel. Please let me know what the trouble code is. I am guessing you will get a induced draft fault.
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There should not be a pilot on a direct vent furnace. When you turn up the thermostat for heat the 1st thing to happen is a venter motor should start, it should vent for approximately 45 seconds, the air switch will verify a vacuum in the burner box, then a spark igniter should start clicking to start the pilot, then the flame rod will verify the pilot, the igniter will stop clicking, and the main burner will ignite and remain on until the thermostat has satisfied the set point. These guideline steps must be satisfied before the controller advances to the next step. The 1st step is the venter motor running, sometimes the motor will stick over the summer months, spin it manually to unstick it. PS, nothing runs if the fan door cover is open, as that shuts down the power to the whole furnace.
I had two flashes on a Honeywell 8670 continuous retry controller to my Burnham power vent natural gas furnace.In my furnace the two flashes meant the last attempt at starting failed and it was going to retry in 90 seconds.
In my case the furnace actually had two intermittent problems with similar codes. The first issue was the high voltage pilot light cable was also a combination flame sensor wire. The cable was supposed to clamp on to the pilot assembly like a spark plug wire.
When it was installed the clamping bits were too far apart and some fool decided since it wasn't sticking he would glue it on. This worked initially, but later the connection was only good enough to pass the high voltage not the low current DC signal back to the controller indicating the flame started successfully. Flames conduct a small amount of electricity due to ionization and the controller senses this.
I pinched the clamping bits together with some pliers. Then it fit tight and kept working.
Other reasons for the 2 flash code on my controller might be no gas or pilot light failure.
My other problem was a partially failed capacitor on my power vent motor caused the vent fan to run in reverse on say one in one hundred start attempts. Once it started running in reverse it wouldn't run forward without stopping it completely, which took several minutes of off time. The capacitor was available quickly and inexpensively from McMaster Carr.
the reason that the line is frozen is because of one two things:
First there is enough air passing over the A coil on your furnace.
Could be dirty filters - closed vents- furnace fan will not run/ stops and starts (bad motor).
Second the charge on your a/c unit is low.
This is possible, however it is possible they are missing something simple. I hope you can follow along. 1) Is this a Sealed Combustion Furnace, meaning you cannot get to the burners even after you remove the Door Panels?
2) If yes, is this furnace vented with pvc/plastic piping? 3) If yes, do both pipes go outside? 4) If yes then try this.
1) Turn the main power off to the furnace 2) Remove the Door Panel to the burner section. 3) Turn Furnace back and turn the thermostat all the way up. 4)Look into the burner compartment and tell me if the igniter glows red. If it does and the goes out with the burners not coming on.
5) If you feel comfortable or know of someone that is. 6) Turn the furnace off, remove the panel that conceals the burner compartment.
7) Turn the furnace on, if the igniter glows red and the burners ignite. Your problem is in the venting system. Most likely the intake pipe if it goes outside. It could be plugged or something is blocking it. If the burners do not ignite the next thing to make sure that is happening is that the Exhaust blower is operating and you can feel air outside where the pipe terminates. If you it is but no very strong, then your problem could be the inducer motor or to small of vent pipe.
If you could, send me some information about how it starts up 1) Main blower may come on and shut off, make sure the blower runs in on position 1st then back to Auto position. If it does not, you have another problem.
2) The Exhaust blower should come on next 3) About 17secs. later the igniter should glow red. 4) You will here the gas valve make a click 5) The Burners will ignite 6) The flame sensor rod on the far left hand side of the burner will keep the burner lit. If it is dirty the burners will shutdown. 7)About 90secs. later the main blower will come on.
That's an intermittent problem. Could be: dirty filter, dirty blower wheel, dirty secondary heat exchanger, dirty evap. coil, weak or damaged high temp safety, loose wire connection, fault at control board, poor air flow. Just about 100 guesses! Could be's don't solve anything. Check for cleanliness. Clean flame sensor(flame rod that burner flame comes in contact with). These are the first I would try.
There is a pressure switch near your draft inducer motor that needs to close when draft inducer motor is running. Verify that the switch is closing. If it is not closing, you might have a problem with either the switch itself, or there could be some sort of blockage in your flue. I would start with the switch first. This switch has to "prove" before it will allow anything else to happen. The loud click could be from your switch or your gas valve. If the switch is closing and nothing else is happening, it could be a problem with your gas valve or HSI.
f this is a metal vent 80% furnace,Turn Furnace off and remove the vent that connects to furnace and see if it is plugged.
If this is a High Eff furnace witrh pvc vents for exhaust and intake air make sure they are not plugged on the outside.
Turn thermostat all the way up,turn furnace off and wait a few minutes.This should reset any control board fualt.
Turn the furnace back on, if you have a glow coil ignitor it should glow red and then the burners should ignite. If this doesnt happen then:
On High Eff Furnace if the glow coil does not glow red, remove the combustion door to the burners, turn furnace back on, if the glow coil glows and burner ignites, you have an obstruction in the intake air side. If it still does nothing then:
Use caution and remove the exhaust vent from furnace, start furnace, if furnace runs then you have a problem with the vent system