Troubleshooting
Samsung Electronics48
6-3-8 When the 4-Way valve (A,B) is not operating
1. Checklist :
1) Are the 4-Way valve A and B under the operating conditions?
When the COMP A (4-Way valve A) and COMP B (4-Way valve B) are on during the heating operating)
2) Is the power voltage normal?
3) Is the connecting of 4-Way valve A (CN75) and B (CN76) good?
2. Troubleshooting procedure
✳ 4-Way valve operating conditions
(1) During the defrost control, put the 4-Way valve A(B) off.
(2) During the heating operation put the 4-Way valve A(B) on.
(3) The changeover of heating to cooling : put the 4-Way valve off immediately (in case of B and C room).
(4) The changeover of cooling to heating : it is on after 170 seconds delay.
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Keep 4-Way valve off.
Normal
Defect of RY76 (RY77) contact and coil
→ Replace the Relay
Defect of IC06 (IC07) output
→ Replace
Defect of IC04(MICOM) -
replace the IC04 or PCB ass’y
Put off the outdoor unit power and put it on again after 5 seconds.
Select the heating operation of A(B) room by the remote controller.
Normal
Has 3 minutes passed after selection of A(B) room heating?
Is the 4-Way valve A(B) on?
Is the pin #47(46) of IC04 (MICOM) at high (DC 5V) ?
No
Is the 4-Way valve A (B) under operating conditions?
Is the voltage shown across the 4-Way valve A(B) connector
(CN75, CN76) ?
DB98_16045A(4)_1 1/29/04 4:57 PM Page 48
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