Atwood 8940-III fan won't stop
Can someone offer guidance with my furnace? Atwood 8940-III had burned out/seized motor. Tech replaced motor, sail switch and on/off 15a switch on unit. Now it runs, cycles on and heats great. Whe...
Forum Discussion
Old-Biscuit wrote:
The circuit broad has a 'blower power'........old timed delay relay incorporated onto board
T-stat calls for heat
Fan gets power thru circuit board
Fan comes up to speed......sail switch makes up/high temp limit switch already closed...power goes back to board and then to gas valve/ignitor
Heats blows......
T-stat set point gets satisfied....t-stat contacts open
Power to gas valve gets dropped
Fan continues to run until 'blower power' shuts down
Fan not shutting down.......
Bad contact on connector at board. Pull/clean board contact surface with pencil eraser and check that pins in connector are not bent
OR
bad 'blower power'..........NEW board
Low battery ,,,,,,,,,
Fan would not start and if it did it wouldn't come up to high enough speed to move enough air to satisfy sail switch.
Gas valve wouldn't stay open....heating wouldn't happen
Nice description of function, but:
Read the first post by the OP...
"Now it runs, cycles on and heats great. When it comes to temp, flame cuts off but fan only slows a lot""
jim
