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Just looking at error codes and I see my furnace is blinking…

Customer Question
Just looking at error...

Just looking at error codes and I see my furnace is blinking 4 times. This matches the error code of limit switch open. I am trying to fix this.

Contractor's Assistant: How old is the appliance? Have you gotten error messages before?

This is the first time I've notice an error code. I am looking for age....

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

Yes

Contractor's Assistant: Anything else we should know to help you best?

It is a York Affinity 9.S series

Submitted: 8 months ago.Category: HVAC
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Answered in 7 minutes by:
1/4/2018
HVAC Technician: airheatman, HVAC Technician replied 8 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,542
Experience: Furnace, A/C and heat pump specialist.
Verified

The 4 flash code is an open high temp limit error.
There may be
several limits on the furnace.Blow describes locations:
PRI***** *****MIT
The pri***** *****mit control is located on the partition panel and monitors
heat exchanger compartment temperatures. It is a normally closed
(electrically), automatic reset, temperature-activated sensor.
The limit guards against the overheating as a result of insufficient
conditioned air passing over the heat exchanger.
AUXILIARY LIMIT
The auxiliary limit control(s) are located on or near the circulator
blower and monitors heat exchanger compartment temperatures.
They are a normally-closed (electrically), manual-reset, temperature
activated sensors. These limits guard against overheating as a
result of insufficient conditioned air passing over the heat exchanger.
VENT DRAFGAURD
These would be located on the draft hood if you have one on your furnace.
ROLLOUT LIMIT
The rollout limit controls are mounted on the burner/manifold assembly
and monitor the burner flame. They are normally-closed
(electrically), manual-reset, temperature-activated sensors. These
limits guard against burner flames not being properly drawn into the
heat exchanger.
Lets start with the most simple and easy. Look near burners for limits with a little button in center.It will push in to reset.If none are tripped we will go from here. Let me know if you have a multi meter for troubleshooting.

http://i.imgur.com/CGkB9sa.jpg

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HVAC Technician: airheatman, HVAC Technician replied 8 months ago

I have pulled the manual on your furnace and along with an open limit the 4 flash can indicate the fuse on control board could be blown so lets check that also.

https://i.imgur.com/UxPpnn4.png

https://i.imgur.com/kYe4Epz.png

Let me know what you find and we can go from here.

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