Toshiba ESTIA HWS-1102H-E, Service Manual

Page: 97 / 168

96
Toshiba
[P19] <Indication 1> <Indication 2> [4-way valve invert failure]
Outdoor control board operation check direction (Self-hold valve)
1) With the dip switch SW804 set as in the table below, pressing SW801 for approx. 1 second
can check the operation of switching to cooling cycle or to heating cycle.
• The board are energized for 10 seconds.
• Take more than a minute for the next check because the parts (coil, resistance R700)
generate large heat.(This does not apply when no coil is connected.)
2) After the check, set all the SW804 dip switches to OFF.
Note: Check with a tester
With an analog tester: If a tester shows 180DCV or higher, the board is good.
With digital tester:
Although values shown has some range, if its maximum value is
180DCV or higher, the board is good.
Check code
Outdoor LED
indication
Check and Action procedure
(No specific description indicates outdoor unit parts.)
Temperature sensor check
TE sensor CN601
TS sensor CN600
Hydro TWO sensor
If defective, repair or replace it
4-way valve check
If defective, replace it
4-way valve operates normally.
(Check piping temperature at the
time of cooling/heating operation)
No
Yes
Replace 4-way coil
4-way valve coil resistance
is 1.3 to 1.6 k .
No
Yes
Outdoor control board operation
check (See below)
NG
OK
Check outdoor board
If defective, replace it
Switching to cooling cycle Switching to heating cycle
CN701 SW804 SW801
180DCV or higher
Press
1
ON
234
CN701 SW804 SW801
180DCV or higher
Press
1
ON
234
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 96 Monday, October 5, 2009 2:09 PM