swamprat69
Well-known member
If you are referring to the HSI (ignitor), it shouldn't have power or heat up until the blower has started and the blower vacuum switch has closed.
Don't think that I can go much further with this as I am not familiar with the 3 wire temp sensor that is used and also don't have any specs on operation of the circuit board. I can deduce that if the display circuit board/keypad has a higher setpoint temp than the actual water temp and the control module has determined that the blower vacuum switch is open, the next step would be to power the blower through one of the relays and close the vacuum pressure switch to progress through the ignition sequence. But what I can't tell you for sure is why the relay is cycling ( It is possible that the relay is for powering the blower, but for some reason the blower is either not getting power or there is a problem with the blower motor. Also not sure why the relay is cycling with no input from the display citcuit board/keypad.
If you are referring to the HSI (ignitor), it shouldn't have power or heat up until the blower has started and the blower vacuum switch has closed.
You probably need to find a qualified local expert to help you with this.