Hi. My house has a Fraser Johnston furnace (builder fit). Since the past week or so, the furnace does not supply adequate heat to the home. Thermostat (Honeywell) is set at 23 deg. C and the ambient/room temp is 20-21 deg. With these settings, the furnace does not want to heat up the house (or at least the room) to 23 deg. It stops between 20.5-21 deg. The only way to restart heat is to turn the unit off (power switch) or thermostat. Please help.
Check the furnace filter to make sure its not dirty . Dity airvfilters can cause the furnace to overheat and shut off on a high temperature limit switch when the switchs cools down it resets but the furnace has to be shut off to reset the control board. Hope this helps.
Testimonial: "Hi Bobalix. I thought I added this information on the FIXYA site before posting my problem. Thanks for the suggestion. I have already changed the air filter and replaced the batteries from the Thermostat unit."
One other thing you can check is the condensate drain piping if it is a condensing furnace. If the drain is partially plugged the condensate can slowly back up into the furnace causing it to lock out. the liquid then slowly drains out so when you reset the furnace it comes on again. Another thing to check is your heat and return registers. Make sure heatvregisters are fully open and return air grilles are not blocked by anything( furniture etc.) Hope this helps.
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SOURCE: I installed a Intertherm Furnace and A/C unit with
The C on the furnace is an Optional terminal, and is meant to be a low voltage wire, just like terminal Y. Disconnect the wire from the furnace terminal C and you should be fine.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
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