Toshiba HFCR407C - SV3 C Valve Blockage Check Procedure; [Db] SV3 C Valve Blockage Detection

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Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[db] 1. Blockage in SV3C valve
SV3C valve blockage detection 2. Blockage in SV3C valve circuit
Modify coil connection.
(SV3C: CN314)
Coil error  Replace the coil.
Replace blocked part.

No
Is there miswiring of
TK1/TK2/TK3 sensor ?


Yes
No
Is the connection of SV3C valve
and the coil unit normal ?

Yes
Is there blockage in SV3C ?
Check interface PC board.

Yes
Modify miswiring.
TK1 sensor: CN516
TK2 sensor: CN515
TK3 sensor: CN507
Is the resistance value
characteristics of TK1/TK2
sensor normal ?
No

Yes
Sensor error.

No

[
]
( *1) SV3C valve blockage check procedure
1. After resetting the power supply, start a trial operation.
2. Set SW01/SW02/SW03 on interface PC board to 1/16/1, respectively.
3. Check the 7 segment display of interface PC board.
7 segment display
When operation has started “OL” “- - “
During detection of oil level “OL” “FF” or “Numerical”
Judgement result of oil level “OL” “AO” “A1” or “A3”
In case of judgment result “A0” “A1”  Oil level is adequate. Resume the operation.
In case of judgment result “A3”
 Possibility of SV3C valve circuit blockage is considered.
Check the following items.
4. Start a trial operation, confirm that AC220V–240V-power is on to SV3C valve.
5. After operation for several minutes check the
temperature at the secondary side of SV3C (A).
 When temperature is high (equivalent to discharge
temperature at (B)), valve is not blocked.
 If blocked part is found, replace the part.
Oil
separator
Sensor TK1
SV3C
Valve
strainer
Check joint
Capillary
Strainer
Accumulator
Check
joint
Capillary
Strainer
Sensor
TK2
Compressor
Valve
SV3A
Oil tank
Check
valve
Check
valve
Oil
removal
valve
Valve
SV3B
Check
valve
Balancing pipe valve
Strainer
Strainer
••
(A)
(B)
Strainer