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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
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: 7 months ago.
Category: HVAC
Expert:  BillyHvac replied 7 months ago.


what is the make and model number?


Customer: replied 7 months ago.
M3RL060A BW. Serial number is *****
Expert:  BillyHvac replied 7 months 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 7 months ago.
Pushed it now status is flashing twice
Expert:  BillyHvac replied 7 months ago.

so the exhaust is fan is running or not?

Customer: replied 7 months ago.
Expert:  BillyHvac replied 7 months 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 7 months ago.

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