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Thermostat is holding at 58 degrees. I changed the batteries…

Customer Question
Thermostat is holding at...

Thermostat is holding at 58 degrees. I changed the batteries but no change

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

Not sure. The fan is running but the gas jets are not coming on

Contractor's Assistant: Do you plan on doing the work yourself?

Maybe

Submitted: 6 months ago.Category: HVAC
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Answered in 5 minutes by:
1/6/2018
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 18,713
Experience: 20yrs in the HVAC industry with certificates and degrees.
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One moment please..Note it takes time to type and add links so please be patient. Also the site will send you a phone call offer, that is not me.

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HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

This is likely a furnace issue can you get to the control board in the furnace and see if it is flashing any error codes?

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Customer reply replied 6 months ago
The yellow status light flasslhes twice then repeats
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

what is the make of the furnace?

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Customer reply replied 6 months ago
York. Now it is flashin 3 red.
Customer reply replied 6 months ago
Now 5 red flashes
HVAC Technician: HVAC Guru, HVAC TECH replied 6 months ago

That is a pressure switch code, meaning the pressure switch is not closing when the exhaust fan is coming on. So you need to check and make sure the exhaust fan comes on first. You can cycle the power off to the unit at the switch or breaker for a minute and turn it back on to clear the code and restart a heat cycle making sure the thermostat is on or you have R to W jumpered on the board in the furnace. If the fan does not come on check the fan for power. If the fan does come on and nothing is plugged in the exhaust or intake vent then check the pressure tube for blockages. That is the rubber tube that connects the pressure switch to the blower housing. If that tube is blocked or cracked that code will come up. You need to check the port where the tube connects to the exhaust blower housing make sure that port is not blocked with crud. Normally it is one of these issues causing that code on the furnace. Lastly you have to check all condensate lines on the unit, especially the drain line that comes out of the inducer motor housing to make sure nothing is blocked causing a backup of condensate water.

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