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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have an infinity touch thermostat from carrier. On the

Customer Question

I have an infinity touch thermostat from carrier. On the screen, it says system fault, and under it, it says 33-limit fault. There currently is no heat in the house.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: Double check the thermostats settings to what? And the filter shows that it's 60% done.
JA: Do you plan on doing the work yourself?
Customer: Great question. If it's a simple fix, sure.
JA: Anything else we should know to help you best?
Customer: No.
Submitted: 19 days ago.
Category: HVAC
Expert:  airheatman replied 19 days ago.

Furnace has shut down on a high temp switch.

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 normallyclosed

(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.

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.Have you checked the little flame rollout switches above burners?If not they will have a little red button in center that pushes in to reset.Let's start there.

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

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