-52-
6.4.3
List of Check Codes
Out of place, break,
short-circuit.
Operation
continuing
1.
Check the indoor temp. sensor.
2.
Check the indoor PC board.
INDOOR
HEAT-EXCHANGER
SENSOR (TC).
Out of place, break,
short-circuit.
Operation
continuing
1.
Check the indoor heat-exchanger sensor.
2.
Check the indoor PC board.
RETURN SIGNAL
NOT COMING TO
INDOOR
Operation
continuing
1)
Wrong wiring in connecting
cable (serial signal).
4-WAY VALVE
SYSTEM
1)
Indoor heat-exchanger
temperature rises, after
starting cooling operation.
2)
Indoor heat-exchanger
temperature drops after
starting heating operation.
Operation
continuing
1.
Check the 4-way valve.
2.
Check the 2-way valve and check valve.
3.
Fault with indoor heat exchanger sensor.
4.
Check the indoor PC board.
OTHER CYCLE
SYSTEM
1)
Indoor heat exchange
temperature does not
change after starting
cooling/heating operation.
2)
When transmitting
instruction for stopping
compressor by freeze
preventing control.
Operation
continuing
1.
Compressor case thermostat, IOL, OL operation.
(contactor OFF, compressor stops: AH8 Models)
(contactor ON, compressor stops: AH Models)
2.
Indoor heat-exchange sensor out of place.
3.
Check the indoor PC board.
4.
Check that service valves are OPEN.
Outdoor unit stops
(indoor fan L)
1.
Check the charged amount of refrigerant gas.
(Gas shortage
→
gas supplement, check for gas leaks)
2.
Indoor fan locked.
DEFROST SENSOR
(TE)
Full stop
1.
Check the defrosting sensor.
2.
Check the outdoor PC board.
ROOM TEMP.
SENSOR (TA).
Out of place, break, short-
circuit.
1.
If outdoor unit does not work at all.
(1) Check the connecting cable correct wrong wiring.
(2) Check the outdoor PC board.
2.
If operates normally.
Between indoor terminal plates 2 and 3, return signal is:
Available:
Check the indoor PC board.
Not available:
Check the outdoor PC board.
Heronhill - for all your Toshiba requirements
Tel: 01823 665660
www.heronhill.co.uk
Fax: 01823 665807