I've searched the forum and found a few threads on this; I believe I've tried everything and wanted to do a sanity check with the group before I buy a new circuit board.
This is an '06 International with the 6 gallon, electric ignition, LP water heater. Heater has been working fine for 6 weeks, but I flipped the switch on this morning and the light just stays on.
I've done the following:
- Checked the gas. One gas tank is full, other is about 1/3. (furnace is working, but I've even tried flipping over to the full tank on the switch in case the switch was broken)
- Checked the brown power lead (at the harness going into the circuit board). It's getting 12V
. This means that the unit is indeed getting enough power, and that the thermal cutoffs are in good shape. (I tried killing the power to all other appliances just in case, but I'm on shore power, so this shoudln't really matter anyway)
- Disconnected all terminals and cleaned them with contact cleaner.
- Removed the circuit board, brought it inside, cleaned it, put it in front of a fan in case it was damp or something.
- I've left the switch on and plugged/unplugged the circuit board connector. Other threads said to listen for the gas valve opening or the spark going, neither of these happen. Nothing happens at all.
- If I disconnect everything, the light on the switch in the bathroom goes out. So I don't suspect a bad switch. It goes back on if I reconnect everything and flick it on.
- I've inspected everything for nests/bugs/etc.
So basically, I hit the switch in the bathroom, the light goes on, never goes out, and nothing happens back at the pump. I do not smell gas. It seems completely dead. It doesn't even open the gas valve or try to start.
The circuit board can't be completely dead, considering the light on the bathroom switch is still coming on correctly. But I suppose it's possible to only be semifunctional?
Anyone have any other thoughts before I blow $115 on another circuit board? This started during a rainstorm, but it has been raining here for the last couple of weeks nad I never had trouble before.