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Randall, RVIA Certification
Category: RV
Satisfied Customers: 11361
Experience:  RVDA/RVIA Master Certified Technician with many years experience.
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Furnace will not start. Red blinking light on circuit board

Customer Question

Furnace will not start. Red blinking light on circuit board says return air blockage. Can't find any obvious blockage. Fan motor and circuit board very dirty. Can this cause fault code?
JA: Just to clarify, can you tell me which light it is? And does it blink first, then stay on steady?
Customer: Red light on circuit board. One flash every 3 seconds.
JA: What is the model/year of your RV?
Customer: 2012 Voltage V 3005
JA: Are you fixing your RV yourself? What have you tried so far?
Customer: Dissasembled furnace cabinet. Examined circuit board. Trying to get it running before weekend, hoping there is a simple fix
JA: Anything else you want the mechanic to know before I connect you?
Customer: Not sure what make or model furnace. No info in owner's manual!
Submitted: 11 months ago.
Category: RV
Expert:  Randall replied 11 months ago.

That can be from any number of things. Has this been sitting any length of time? If so, fire up a stove top burner and let the pressure equalize and then try the furnace again. Try it up to 4 times and see if the unit starts. Let me know if it doesn't and we can go from there.

Expert:  Randall replied 11 months ago.

Just wondering if you perhaps missed my previous response to your question? If you still need some input from me and assistance in resolving this, please get back to me here. Thanks.