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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a York furnace that won't turn on, it has 4 red

Customer Question

I have a York furnace that won't turn on, it has 4 red flashes
JA: Did you check the furnace's filters?
Customer: Yes, I did, I even remove it but it won't help
JA: Do you plan on doing the work yourself?
Customer: yes, I'm trying, but if I can't I need some expert to come and check
JA: Anything else we should know to help you best?
Customer: It sounds like the air flow is blocked if I got 4 red flashes
Submitted: 11 months ago.
Category: HVAC
Expert:  Rick replied 11 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

First thing to check is the rollout switch(es) (see attached for typical)which are just outside the burner chamber. Turn the power off to the unit then push the small button between the 2 wires. If it clicks you have reset it. If it doesn't click it wasn't tripped. Then turn the power back on. It will fire up with any luck if it was tripped.

Customer: replied 11 months ago.
I'm trying to figure out where it is
Expert:  Rick replied 11 months ago.

It's just outside where the burners are. If there is a box enclosing the burners it will be on the side or the top of the box

Customer: replied 11 months ago.
I think I found it, let me try to reset it
Expert:  Rick replied 11 months ago.

Ok

Customer: replied 11 months ago.
there are 3 roll out switches in my furnace
Expert:  Rick replied 11 months ago.

Then you need to press the reset on all of them.

Customer: replied 11 months ago.
I pressed them hard but there is no click sound
Expert:  Rick replied 11 months ago.

Then you probably have another opem limit in the circuit. Do you have a multi-meter?

Expert:  Rick replied 11 months ago.

Also try turning thepower back on anyway and see what happens

Customer: replied 11 months ago.
I do
Customer: replied 11 months ago.
furnace is still not on, the blower is working, but no flame, still 4 flashes
Expert:  Rick replied 11 months ago.

Then you need to trace the 2 wires connected to the rollouts back to the control board and test for continuity across those 2 leads at the board.

Customer: replied 11 months ago.
the error code is: limit switch open, but I don't know what it means
Expert:  Rick replied 11 months ago.

It means you have an open limit device/switch in that circuit that has the rollouts as well. The next step is the continuity test I outlined above if you want to diagnose this further.

Customer: replied 11 months ago.
use the multimeter to test where?
Expert:  Rick replied 11 months ago.

You need to trace the 2 wires connected to the rollouts back to the control board and test for continuity across those 2 leads at the board.

Expert:  Rick replied 11 months ago.

You can also test for continuity across any device you come across in that circuit. Be sure the power is off before you test this way