Split system (Single phase and 3-phase type)
42 Maintenance Document 1544-1
3.1.2 Electrical System
Outdoor Unit Overvoltage
Check for possible causes in the list below (this list is
not exhaustive):
Problem with the compressor
Main board
Faulty power relay
Steps to be followed before performing any work
on the Inverter module:
First switch off the system using the circuit
breaker at the head of the line.
Remove the unit cover and then remove the
Inverter module cover.
Measure the voltage at the condenser terminals.
You should find a value of 5 Vdc or less.
Inspection of the Power Transistor Module (Main board)
Disconnect the compressor relay and the condenser
connection. Measure the resistance value at the
points shown on the illustration, and then compare
the values observed with those in the table.
Multimeter Resistor
1 MOhm
or more
N
W
V
U
P
Main PCB
Terminal block
3-phase type Single phase type
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