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NOTE: SPRINKLER MUST HAVE POWER FOR THE DRYER TO OPERATE.
B. Drive motor is not operating (does not start)...
* Microprocessor controller (computer) relay output indicator (either forward “FWD” or reverse
“REV”) is on.
1. Blown drive motor contactor overloads.
2. Failed drive motor contactor.
3. Failed drive motor.
4. No 24 VAC present at drive motor contactor coil.
* Microprocessor controller (computer) relay output indicator (neither forward “FWD” nor reverse
“REV”) is on.
1. Failed microprocessor controller (computer) input/output (I/O) board.
C. Drive motor operates in one (1) direction ONLY...stops and restarts in the same direction...
* Appropriate microprocessor controller (computer) relay output indicator is on.
1. Failed reversing contactor (relay).
2. Failed electrical reversing contactor interlock.
* Appropriate microprocessor controller (computer) relay output indicator is off.
1. Failed microprocessor controller (computer) I/O board.
D. Drive motor operates okay for a few minutes and then either repeatedly or occasionally trips
the overload protector...
NOTE: When the overload protector trips, the microprocessor controller (computer) I/O board, “red”
light emitting diode (L.E.D.) “TBOL” will be off and the display will read
“Tumbler Overload Fault.”
1. Motor is overheating...
a. Motor air vents clogged with lint.
b. Low voltage to motor.
c. Failed motor.
d. Basket (tumbler) is binding...check for an obstruction.
e. Basket (tumbler) bearings are binding.