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CHECK CONTROL BOARD FUSE #2 – This routine identifies the opening of the main fuse (fuse 2) on the
Phase 7 dual microprocessor controller (DMC) computer. If the fuse has opened, the Phase 7 DMC (computer)
will not allow a cycle to begin and will display “CHECK CONTROL BOARD FUSE #2” condition. If the fuse
has opened after the cycle has begun, it will still trigger the CHECK CONTROL BOARD FUSE #2. The dryer
will shut off ALL outputs and will go into a Fault Mode with a brief audio indication. The Phase 7 DMC
(computer) will then monitor the Phase 7 DMC (computer) Fuse #2 Input. If the Phase 7 DMC (computer)
Fuse #2 signal returns for more than 30-seconds, the Phase 7 DMC (computer) will reset itself and will return to
Ready Mode.
EXHAUST PROBE FAULT/AXIAL FAULT – This routine indicates a problem with the temperature sensor
circuit. If the Phase 7 DMC (computer) senses an issue that lasts for more than 3-seconds, it considers this an
error; it will trigger an “EXHAUST PROBE FAULT” or “AXIAL PROBE FAULT” condition and will go into
a Fault Mode with a brief audio indication. The dryer will run with no heat for 3 minutes. Once the 3 minutes
expire, the Phase 7 DMC (computer) will shut off ALL outputs and will remain in fault. The Phase 7 DMC
(computer) will then monitor the temperature sensor input. If the temperature sensor returns for more than
30-seconds, the Phase 7 DMC (computer) will reset itself and will return to Ready Mode.
ROTATION SENSOR FAULT – This routine monitors the pulses from the rotational sensor input. It times
the dwell (stop) between signals. If the time between the pulses exceeds 10-seconds, the Phase 7 DMC (computer)
will trigger a “ROTATION SENSOR FAULT” condition and will go into a Fault Mode with a brief audio indication.
Depending on the model type, the dryer will run the fan with no heat for 3 minutes or until the temperature drops
below 100°F (38°C) for GAS QUAD MOTOR, ELECTRIC QUAD MOTOR and STEAM QUAD MOTOR
models. Once the basket (tumbler) temperature is below 100°F (38°C), or the 3 minutes expire, the Phase 7
DMC (computer) will shut off ALL outputs and will remain in Fault Mode until the dryer is addressed. If the
dryer model is a GAS DUAL MOTOR, ELECTRIC DUAL MOTOR or STEAM DUAL MOTOR model, the
Phase 7 DMC (computer) will immediately shut off ALL outputs, regardless of the basket (tumbler) temperature,
and will remain in Fault Mode until the dryer is addressed.
EXHAUST HIGH TEMPERATURE FAULT – This error routine indicates a problem with overheating. If
the Phase 7 DMC (computer) senses a high temperature condition for more than 3-seconds, it considers this an
error and will proceed accordingly. If the condition exists for more than 15 minutes, the dryer will display
“EXHAUST HIGH TEMP FAULT” and will go into a Fault Mode with a brief audio indication. Also, if the
condition occurs three (3) times within 1 hour of drying time, the dryer will display “EXHAUST HIGH TEMP
FAULT” and will go into a Fault Mode with a brief audio indication. The Phase 7 DMC (computer) determines
this error by monitoring the temperature sensor input to have a steady gradual increase in temperature to a known
upper limit (the limit typically is 20° over the maximum allowed programmable set point). The dryer will run with
no heat for 3 minutes or until the temperature drops below 100°F (38°C). Once the basket (tumbler) temperature
is below 100°F (38°C), or 3 minutes expire, the Phase 7 DMC (computer) will shut off ALL outputs and will
remain in Fault Mode.
BURNER PURGE FAULT – If the Phase 7 DMC (computer) detects the presence of the gas return signal
before sending the heat signal out, the Phase 7 DMC (computer) will trigger a “BURNER PURGE FAULT”
condition and will go into a Fault Mode with a brief audio indication. The dryer will run with no heat for
3 minutes or until the temperature drops below 100°F (38°C). Once the basket (tumbler) temperature is below
100°F (38°C), or the 3 minutes expire, the Phase 7 DMC (computer) will shut off ALL outputs and will remain in
Fault Mode until the dryer is addressed.
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