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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Where do I find the limit control switch, First time. My

Customer Question

Where do I find the limit control switch
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: First time. My furnace is blowing cold air and the status light slow blinks once
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: Yes and clean
JA: Do you plan on doing the work yourself?
Customer: My husband will be
JA: Anything else we should know to help you best?
Customer: My husband checked the vacuum switch and condensate hoses when it had flashed twice in a row then a pause then twice more
Submitted: 10 days ago.
Category: HVAC
Expert:  BillyHvac replied 10 days ago.


what is the make and model number?


Customer: replied 10 days ago.
M3RL060A BW. Serial number is *****
Expert:  BillyHvac replied 10 days ago.

Ok here is the parts placement click here

And here is a manual on the furnace HERE

Does the exhaust fan run?

Customer: replied 10 days ago.
Pushed it now status is flashing twice
Expert:  BillyHvac replied 10 days ago.

so the exhaust is fan is running or not?

Customer: replied 10 days ago.
Expert:  BillyHvac replied 10 days ago.

thank you.

Now the first item to check is chimney pipe...are we sure the pipe is clear and the cap not covered, nest, snow etc?

Expert:  BillyHvac replied 10 days ago.

then we want to check a couple other items so let me know when ready to proceed