Have HVAC Questions? Ask an HVAC Expert for Answers
Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can
continue our conversation.
This sounds like a flame sensing problem. What does the decal on your unit say a 4 blink error indicates?
Check all your connections on the board and at the rollouts. Will the unit fire up again without resetting the rollouts?
Ok, that 's what I thought. Check the connections on the flame sensor and be sure the flame sensor is positioned in the burner flame.
As long as it's engulfed by the flame it's ok. More likely a loose connection since you don't have a lot of wiggle room positioning the sensor
You need a meter that can read micro amps to check the output from the sensor. You also need to check the other end of the lead where it connects to the board.
You should see 3 to 5 micro amps. If the connections are good and the sensor is engulfed by the flame check if the ceramic insulator has any crack in it. If everything checks out you could have a defective board. You should call Modine tomorrow if everything checks out 1.***-***-****
There isn't much more I can add. I'm logging off for the night. If you don't have any more questions I'd appreciate a favorable rating. If you have more questions I'll respond in the morning
Do you have more questions?