Alto-Shaam HALO HEAT 750-GDU Manual de uso y mantenimiento - Página 6
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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.
Error Code
1. Control displays "OOO".
INCREASE/DECREASE
HEAT
ROCKER BUTTON
L.E.D.1
INDICATOR L.E.D.
ooo
prg
SET
!
°F
ERROR CODE
ERROR
TEMPERATURE
INDICATOR L.E.D.
CODE
SET
DISPLAY
BUTTON
2. Control displays "CCC".
INCREASE/DECREASE
HEAT
ROCKER BUTTON
L.E.D.1
INDICATOR L.E.D.
CCC
prg
SET
!
°F
ERROR CODE
ERROR
TEMPERATURE
INDICATOR L.E.D.
CODE
SET
DISPLAY
BUTTON
3. Unit does not operate.
4. No display in electronic control.
5. Cannot control temperature but sensor
and electronic control check OK.
6. Temperature readout incorrect.
Tr o u b l e S h o o t i n g G u i d e
Possible Cause
A. Sensor is open circuited.
POWER
ON/OFF
ROCKER SWITCH
B. Associated wiring is open circuited.
C. Control is faulty.
A. Sensor is short circuited.
POWER
B. Associated wiring is short circuited.
ON/OFF
ROCKER SWITCH
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.
DISCONNECT UNIT FROM POWER SOURCE
BEFORE CLEANING OR SERVICING.
#828 Operation & Care Manual - 5.
Action Required
Detach the sensor from the terminal
block. Use an Ohm meter to measure
the resistance of the sensor. Check
SENSOR
sensor at 32°F (0°C) using a container
of ice water. If Ohm reading is 100,
EXT. WIRES
replace display. If Ohm reading is not
T-BLOCK
CONNECTORS
100, replace sensor.
Check wires for integrity. Check for
proper and secure connections at the
thermostat and terminal block. If neces-
sary, re-secure the faulty connections.
Energize system after the above steps
have been completed. If control still
reads "OOO", call service technician.
Detach the sensor from the terminal
block. Use an Ohm meter to measure
SENSOR
the resistance of the sensor. Check
sensor at 32°F (0°C) using a container
of ice water. If Ohm reading is 100,
EXT. WIRES
T-BLOCK
CONNECTORS
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 neces-
sary, re-secure the faulty connections.
Energize system after the above steps
have been completed. If control still
reads "CCC", 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.