Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I have a LP horizontal AIREFLOW furnace and it fires up pand runs fine for about 5 mins, then the burner shuts off and re lights over and over again before the stat has reached temp setting. I have replaced the pressure switch, the gas valve, the control board and it is still doing it. It has 2 inch PVC vent pipes for intake and exhaust. HELP!

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Assuming you have A/C on this system, I would look to see if the evaporator is plugged with dust from a failed filter.

That causes the exact symptoms that you describe, assuming the filter is clean and all supply and return vents are open as the system was designed to operate.

Let me know what you find or you rthoughts and I can give you instruction on how to clean. One indication it's the evap being plugged is buildup on the blower blades. That will need to be cleaned too.

Posted on Jan 28, 2009

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Gas Furnace Repair - How to Change the Pressure Switch


Your gas furnace is not working and you think that the pressure switch is bad. Here are some things to check and the steps to replace it. Replacing is not very difficult at all, in fact it is one of the easiest thing that you can replace yourself.

Your gas furnace purge blower runs and never shuts off but your furnace is not producing any heat. Or your igniter will glow, light the burners and then the furnace will shut right back down and try to recycle all over again. Either one of these conditions are common if the pressure switch is going bad or has failed.

You can check the switch by placing a jumper wire across the wires going to the pressure switch once the purge blower has started. If the burner lights and stays lit the pressure switch is probably your problem. Could be a weak blower, but I would try the Pressure switch first; it is much less expensive to replace.

Once you isolate that the pressure switch is faulty, then you can change it. This is very simple. For most furnaces the wiring is low voltage, so the risk of shock is minimal. You should still turn off the power to be safe. Remove the screws that secure the switch and then just switch the two wires over to the new switch and secure the screws again.
That’s all there is too it a very simple operation.

Turn the power back on to the furnace. Re-fire the furnace and check the operation of the unit. It takes a while for the unit to cycle through the lighting process but you should have a furnace that now heats your house just fine.

http://www.fixya.com/support/r4016017-find_air_conditioning_heating_furnace

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