Alto-Shaam QC-50 Instructions d'exploitation télécharger pdf (Page 18)

#891/3 • INSTALLATION/OPERATION/SERVICE MANUAL • 17.

SERVICE

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.

Trouble Shooting Guide

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

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 37 38

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Alto-Shaam QC-50 Instructions d'exploitation Page 18

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