Toshiba RAV-SM1603AT-E Service Manual page 78

[P19 error]
Is operation of 4-way valve normal?
(Check pipe temp., etc. in cooling/heating operation.)
Is the coil resistance value of
4-way valve between 1.3 and 1.6kΩ?
Check operation of outdoor P.C. board.
(See below.)
Check 4-way valve.
Defect → Replace
Check method of outdoor P.C. board operation (Self-hold valve type : SP110, SP140)
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.
• When checking again, check operation 1 minute or more after the first check because exothermic of part
(Coil, resistance R700) is large. (There is no problem when coil is not connected.)
2) After check, turn off all the Dip switch SW804.
Exchange to cooling cycle
SW804 SW801
Note) Check by tester
Analog tester : Good if over DC200V
Digital tester : Good if Max. value is over DC200V though the varied value may be displayed.
NO
YES
OK
CN701
1
Push
4
DC200V or more
YES
NO
Error
Exchange to heating cycle
SW804 SW801 CN701
1
Push
4
– 78 –
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
DC200V or more