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I have G40UH(X) furnace. Heater is running for 5 to 6

Customer Question
I have G40UH(X) furnace ...

I have G40UH(X) furnace

Contractor's Assistant: Did you check the furnace's filters?

Heater is running for 5 to 6 minutes then stops flaming after 5 to 6mins and red led slow flash and green led on

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

Yes

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

I cleaned flame sensor and replaced fliter recently

Submitted: 6 months ago.Category: HVAC
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Customer reply replied 6 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 6 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 7 minutes by:
12/25/2017
HVAC Technician: airheatman, HVAC Technician replied 6 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,175
Experience: Furnace, A/C and heat pump specialist.
Verified

The error is a limit error. Furnace is overheating or limit is bad

ACTION 1 − Check continuity across switch(es).
Switches reset automatically upon cool down.
ACTION 2 − Check for restrictions on blower inlet
air (including filter) and outlet air. Determine
cause for limit activation before placing unit back
in operation.

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Customer reply replied 6 months ago
I didn't understand
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

One of thee limit switches is opening.

This can be caused by a dirty filter,dirty ac coil, blower not moving enough air or a bad heat exchanger

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airheatman
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Category: HVAC
Satisfied Customers: 9,175
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