I have a MastertTemp 400 that is intermittent. When the heat command is given, the blower will start and the heater will fire. Sometimes it will stay lit, other times it will only burn for about 5 to 10s and turn off. It will immediately try again to lite after the fan purge. Sometimes it will stay lit after the retry and other times it won't. After a few tries it gives up and says service heater.
I took the side panel off and checked th diagnostic LEDs while the service heater light was on. This is where I am stumped and what triggered my post. None of the LEDs indicating what was at fault are lit. Does this indicate a circuit board issue?
Thanks in advance for any help. If it is circuit board related, hopefully I can hold out for that new rs485 board that is pending release!
I took the side panel off and checked th diagnostic LEDs while the service heater light was on. This is where I am stumped and what triggered my post. None of the LEDs indicating what was at fault are lit. Does this indicate a circuit board issue?
Thanks in advance for any help. If it is circuit board related, hopefully I can hold out for that new rs485 board that is pending release!