Water Heaters - Water Heater Doesn't Work
Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.View Full Version : Water Heater Doesn't Work
danerigden
08-14-09, 11:19 AM
I have a Rheem gas water heater that won't light. The gas valve never opens.
It has a Robertshaw HS780 17NL 104A controller. I thought this was faulty so replaced it with a 304A controller. Same problem
24 volts is present at TH connection, blower is working, igniter lights up but 24volts never appears at "VALVE" connection (on the controller).
If I force 24volts to gas valve at the appropriate time, heater lights and works normally.
It has a Robertshaw HS780 17NL 104A controller. I thought this was faulty so replaced it with a 304A controller. Same problem
24 volts is present at TH connection, blower is working, igniter lights up but 24volts never appears at "VALVE" connection (on the controller).
If I force 24volts to gas valve at the appropriate time, heater lights and works normally.
wirenut1110
08-16-09, 07:48 AM
Something i would try and/or check out is the ground on this board.
Some of these electronic boards use a ground to work (in the electronic sense) even if it means the board is mounted with screws. I've seen people replace a board but not mount it the way it was to see if it worked and it still didn't because the "ground" was still disconnected.
Some of these electronic boards use a ground to work (in the electronic sense) even if it means the board is mounted with screws. I've seen people replace a board but not mount it the way it was to see if it worked and it still didn't because the "ground" was still disconnected.