Toshiba MMU-P0121H Service Manual page 96

Check code
[dC]
Oil level detection circuit
leakage detection
Is resistance value
characteristics of TK1
sensor normal?
YES
Is there leakage of SV3C? (
No leakage
Replace SV3C valve.
( * 1) SV3C valve leakage check procedure
1. Start a trial operation under condition that connector of SV3C is removed.
2. During operation, check temperature at secondary side of SV3C valve (A part in the following figure).
→ If temperature is high, leakage from SV3C valve is considered.
Replace SV3C valve.
1. SV3C valve leakage
2. TK1 sensor resistance value characteristics error
3. Outdoor unit operation in high outside temperature
NO
Is it an operation in high
YES
1) ambient temperature?
*
(Outside temp. 43˚C or more)
Check interface P.C. board.
TK1 SV3C valve
A
sensor
Strainer
Capillary
TK2
sensor
Oil
tank
Oil
Check
SV3A
removal
valve
valve
valve
Check
valve
Balancing pipe valve
Operation cause
YES
NO
Check joint
Capillary
Oil
separator
Strainer
Accumulator
Compressor
Check
SV3B
valve
valve
Strainer
3-93
Sensor error
It is protective stop due to
operation in high ambient
temperature.
Clear the alarm, and start the
operation.