Toshiba RAS-M10YKV-E Service Manual page 60

10-6. Check Code 1C (Miswiring in indoor/outdoor units, disconnection of TGa sensor) and 1E
<Check procedure>
1C
Disconnection of Miswiring in indoor/outdoor
TGa sensor, units, gas leakage,
P.M.V. sensor error disconnection of TS/TC
(Check code 02, 1C) sensors (Check code 02, 1C)
connecting cable in A/B rooms
of indoor/outdoor rooms?
Replace cables in A/B rooms
of outdoor terminal block.
Is coil of the pulse modulation valve
Is connector of coil connected to inverter?
Are connections of A/B rooms correct?
Is positioning sound of valve (sound hitting to stopper) heard from valve
when the air conditioner starts the operation after turning off power of the
air conditioner once?
NOTE :
After all the operations stopped by the remote control, the power keeps
being supplied to outdoor unit for approx. 3 minutes. If operating the air
conditioner by remote control again just after all the operations stopped by the
remote control, positioning of the valve is not performed when outdoor unit is
activated because supplying power to the outdoor unit is not interrupted.
After positioning of the valve, activate the compressor and the outdoor fan.
It takes approx. 7 seconds for positioning of the valve, and sound ticktack
(hitting sound to stopper) is heard for approx. 0.5 seconds at least of that
period. As the sound is low, check sound by using screwdriver, etc.
Are temp. sensors of indoor/outdoor units correctly set to the holder?
NOTE :
The temperature sensors which are used to control electronic control
valve include indoor heat exchanger sensor (TC), A room gas side temp.
sensor (TGa), and outdoor suction temp. sensor (TS).
Gas amount check and valve clogging check
Check them when operation is performed in only one of A or B room.
Remove TC sensor connector from the P.C. board in indoor unit.(Remove connector from the P.C. board.)
Operate the air conditioner in COOL mode by TEMP button ("Pi" sound is heard if keeping pushed for 10 seconds.).
The operation enters temporary operation mode which fixes opening degree of P.M.V. and No. of revolution of
compressor. Check condensation at outlet of P.M.V., and then check operating pressure from the service port.
Existence of condensation at outlet of P.M.V.
If there is condensation at outlet (1/4 inch=Ø6,35mm valve side),
Check the operating pressure from service port, and add gas if pressure is low.
1C
Is there miswiring of
NO
YES
Valve drive check
(P.M.V.) correctly set?
YES
YES
YES
YES
the valve is clogged.
1E
Discharge temp. error,
gas leakage
(Check code 03, 1E)
NO
NO
NO
NO
YES
– 60 –
Operation
Check Item
Considerable main cause
Measures
Item by symptom
Set it correctly.
Set it correctly.
Replace coil valve.
Set it correctly.
Replace valve.
Add gas.