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Our furnace is not working - we're getting fault code 13 on…

Customer Question
Our furnace is not...

Our furnace is not working - we're getting fault code 13 on our thermostat readout. It says system fault 13 - limit lockout. The temperature is going down is at 63. Its below 0 outside

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

I don't know. Could be either. Last night I noticed it, the fan seems to be working on the furnace, but not sure what the problem is.

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

No

Submitted: 8 months ago.Category: HVAC
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Answered in 8 minutes by:
1/1/2018
HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 18,886
Experience: 20yrs in the HVAC industry with certificates and degrees.
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HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago

This is likely a thermal rollout issue. There are high limit safety thermostats that are around the burner housing area that can trip open if they fail or the unit is overheating. Some of these have reset buttons on them that you can manually press down to reset while others do not. The ones that do not either are one time limits or are limits that are suppose to manually reset when cooled down. Now that does not always happen when they go bad so you will have to check them for continuity with an ohm meter across the two leads going to them. If you do not pwn a ohm meter you can physically bypass each rollout to make sure it is good by connecting the two wires to each rollout sensor together to see if the unit will then operate. Now once you have found the bad one you can change it out or reset it and then you should check your furnace filter for blockages and make sure you main furnace blower is running to speed. These two things can cause a unit to overheat and trip one of these rollout sensors. Mosts units have 3 of these devices and here is a link to what they can look like on your unit.

CLICK HERE

CLICK HERE

CLICK HERE

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