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My furnace fan kicks on after reset (or if I force heat on…

Customer Question
My furnace fan kicks on...
My furnace fan kicks on after reset (or if I force heat on from thermostat) but heat never kicks in
Submitted: 2 years ago.Category: HVAC
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Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 56 minutes by:
2/15/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,080
Experience: Furnace, A/C and heat pump specialist.
Verified

You should get an error code on control board in blower compartment indicating what has failed.Can you check and let me know pattern of flashing?

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Customer reply replied 2 years ago
3 red flashes
Customer reply replied 2 years ago
It is green flashes the Once the blower starts it is 3 red flashes
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK this is telling us the pressure switch is not closing or staying closed.

This could be

caused by a number of problems: faulty inducer, blocked vent pipe, broken

pressure switch hose or faulty pressure switch.

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Customer reply replied 2 years ago
How do you recommend I determine which? The vent pipe looks in good condition and did not see any blockage from the outside. I also don't hear any clicking on start. And although it sounds like it's burning there is no heat or light from the furnace.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

1.If pressure switch is open, burners should not be on.

2.First lets make sure the small vent motor is coming on.

3.If so lets try this.

Next I want you to locate the pressure switch. It will be a small round canister with a hose attaching it to the inducer housing. Remove hose from inducer housing and leave it attached to the pressure switch. Power off and back on to reset board again, Then call for heat at thermostat. Allow inducer to start then suck on the end of hose still attached to pressure switch and see if switch will close and burners ignite.

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Customer reply replied 2 years ago
I hear the small click, but I dont see any ignition.
Customer reply replied 2 years ago
No. I do not see anything glowing
Customer reply replied 2 years ago
Looks in good condition can send a picture if it helps
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

When sucking on hose still attached to switch do you still get error code?

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

D you have a meter to verify the switch contacts are closing?Either switch is bad or board is not reading it closed.

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Customer reply replied 2 years ago
I do which contacts should I check.
Customer reply replied 2 years ago
The switch always seems open if if I try to close it by pulling air our
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Sentence did not complete. Please explain

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Customer reply replied 2 years ago
I put a resistance meter across the pressure switchs two terminals after removing the wires from the two terminals. Even when sucking air from the switch I could hear a click but did not see any change in resistance between the terminals.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK looks like pressure switch is the problem You will need to replace it.

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