Alto-Shaam 10-18W, Installation Operation & Maintenance

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# 8 9 1 / 3 • I N S TA L L AT I O N / O P E R AT I O N / S E RV I C E M A N U A L • 17.
S E R V I C E
Error Code
1. Control displays "OOO" or “PFO”.
2. Control displays "CCC" or “PFC”.
3. Unit does not operate.
4. No display in electronic control.
5. Cannot control temperature but
sensor and electronic control check
out OK.
6. Temperature readout incorrect.
Possible Cause
A. Sensor is open circuited.
B. Associated wiring is open circuited.
C. Control is faulty.
A. Sensor is short circuited.
B. Associated wiring is short
circuited.
C. Control is faulty.
A. Insufficient power supply.
B. Defective power cord or plug.
A. Faulty power supply board.
B. Faulty electronic control.
A. Faulty relay.
B. Heating element sensor.
A. Dirty or faulty sensor.
B. Faulty control.
Action Required
Detach the sensor from the terminal
block. Use an Ohm meter to measure the
resistance of the sensor. Check sensor at
32°F (0°C) using a container of ice water.
If Ohm reading is 100, replace display. If
Ohm reading is not 100, replace sensor.
Check wires for integrity. Check for
proper and secure connections at the
thermostat and terminal block. If
necessary, re-secure the faulty
connections.
Energize system after the above steps
have been completed. If control still
reads "OOO or PFO", call service
technician.
Detach the sensor from the terminal
block. Use an Ohm meter to measure the
resistance of the sensor. Check sensor at
32°F (0°C) using a container of ice water.
If Ohm reading is 100, replace display. If
Ohm reading is not 100, replace sensor.
Check wires for integrity. Check for
proper and secure connections at the
thermostat and terminal block. If
necessary, re-secure the faulty
connections.
Energize system after the above steps
have been completed. If control still
reads "CCC or PFC", call service
technician.
Check power source.
Check and replace if necessary.
Check line voltage for 24V across pins
6 and 7 on the power supply board.
Replace control.
Replace relay.
Replace element.
Detach the sensor from the terminal
block. Use an Ohm meter to measure
the resistance of the sensor. Check
sensor at 32°F (0°C) using a container of
ice water. If Ohm reading is 100,
replace display. If Ohm reading is not
100, replace sensor.
This chart is provided for the assistance of qualified technicians only and is not intended for use by untrained or
unauthorized service personnel. If your unit is not operating properly, check the following before calling your
authorized service agent. Check the power applied to the unit. Plug in outlet? Fuse OK?
Do not attempt to repair or service beyond this point. Contact manufacturer for nearest authorized service
agent. Repairs made by any other service agent without prior authorization by manufacturer will void the
warranty on the unit.
Tr o u b l e S h o o t i n g G u i d e
EXT. WIRES
SENSOR
T-BLOCK
CONNECTORS
EXT. WIRES
SENSOR
T-BLOCK
CONNECTORS
SET
prg
!
ERROR CODE
INDICATOR L.E.D.
HEAT
INDICATOR L.E.D.
ERROR
CODE
DISPLAY
TEMPERATURE
SET
BUTTON
L.E.D.1
INCREASE/DECREASE
ROCKER BUTTON
ooo
POWER
ON/OFF
ROCKER SWITCH
SET
prg
!
ERROR CODE
INDICATOR L.E.D.
HEAT
INDICATOR L.E.D.
ERROR
CODE
DISPLAY
TEMPERATURE
SET
BUTTON
L.E.D.1
INCREASE/DECREASE
ROCKER BUTTON
CCC
POWER
ON/OFF
ROCKER SWITCH