Toshiba RAV-SM304SDT-TR Service Manual page 109

Check Outdoor
code LED display
[P19] <Display 1> <Display 2>
(Item without special mention Indicates part of outdoor unit.)
[4-way valve reversal error]
Does 4-way valve
work correctly?
(Check pipe temp. etc.
in cooling/heating operation.)
NO
Is the coil resistance value
of 4-way valve between
1.3kΩ and 1.6 kΩ?
YES
Check operation of
outdoor P.C. board.
(See below.)
OK
Check 4-way valve.
Defect → Replace
Check method of outdoor P.C. board operation (Self-holding valve type)
1) Set SW804 of Dip switch as the following figure and then push SW801 for
approx. 1 second to check exchange operation to cooling cycle/heating cycle.
• Power is turned on for approx. 10 seconds.
• In case of operating with the coil of 4-way valve connected to CN701, take
interval over 1 minute before re-operation; otherwise it may cause overheat
of the coil.
2) After check, turn off all the Dip switch SW804.
Exchange to cooling cycle
SW804 SW801 CN701
1
Push
4
DC200V or more
Note) Check by tester
Analog tester : Good if over DC200V
Digital tester : Good if the maximum voltage is over DC200V though
the varied voltage may be displayed.
∗ In cooling operation, [P19] error may happen when the refrigerant pressure rose
abnormally. In this case, remove the cause of pressure rising and then diagnose
the error again.
– 109 –
Check and troubleshooting
YES
NO
Error
Exchange to heating cycle
SW804 SW801
<In case of SP80>
Temperature sensor check
TE sensor CN601
TS sensor CN600
Indoor TC sensor
Defect → Correct and repair
Replace coil of 4-way valve.
Check outdoor P.C. board.
Defect → replace
CN701
1
Push
4
DC200V or more