Have RV Questions? Ask an RV Mechanic Online.
Hi my name is Robert....
Are you talking about the water heater or the furnace? Can you explain " I had to trip ignition to the water heater"
Need to be clear, which appliance, make and model, is it sparking etc.....
SO the fan is coming on, you can hear it sparking and smell LP but it is not firing off?
Well that is going to be key if you smell gas but it is not sparking. The circuit board will send a signal to the gas valve and electrode at the same time, so if you do not hear it sparking and smell gas AND you replaced the circuit board I suspect the electrode is bad. IF it is sparking and you smell gas it very well could be a pressure problem, you would need a manometer to check the pressure. Most RV shops have them and is a 15 min check.
IF you do not smell gas then it could be low battery voltage as the fan needs to spin fast enough to close the sail switch, bad sail or limit switch.
Click HERE for a service manual, you can see the order of operation and it will provide you some troubleshooting... Hope this helps some, IF you have more questions or concerns please feel free to contact me... Robert
Was just checking in to see if my answer helped, if you have more questions or concerns please feel free to contact me.. Robert