Mitsubishi Electric SUZ-KA35VA2 Technical & Service Manual page 48

When the operation frequency does not go up from lowest frequency.
U Check of HPS
1. Disconnect the connector CN681 in the electronic control P.C. board.
2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turned off.
Check the resistance between
each terminal.
0
Reconnect CN681.
Turn on power supply to the indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Is HPS protection displayed
immediately after compressor
starts?
No
Normal
Outdoor unit does not operate at all, or stops immediately due to overcurrent.
Check of current-limiting resistor
V
When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.
Is the resistance of current-limiting
resistor (R64A or R64B) on the
noise filter P.C. board normal?
(Normal resistance : 5 5%)
Open
Replace the power P.C. board.
Infinity
Replace HPS.
Yes
Replace the electronic control P.C. board.
Not
Turn ON the power
open
supply and press
EMERGENCY
OPERATION switch.
Does LED on the outdoor
electronic control P.C. board
light up?
Yes
Does the rush current
limiting relay(X64) work
properly?
No
Replace the noise filter P.C.board.
48
[SUZ-KA60VA2.TH]
Replace the noise filter P.C.
No
board or the outdoor
electronic control P.C.
board.
Replace the outdoor
Yes
electronic control P.C.
board or power P.C.board
or the compressor.