154 Powermax125 Service Manual 808070
8 – Troubleshooting and System Tests
Test 3 – Output diodes
Turn OFF the power switch and disconnect the power cord.
Check the 4 diodes in the bridge with an ohmmeter in diode test mode.
For each diode, the value should be “open” (very high resistance) with the meter leads in one direction, and 0.1 V to
1.0 V with the meter leads reversed.
A diode is shorted if the value is less than 0.1 V. Replace both bridges.
A diode is open if the value is greater than 1.0 V in both directions. Replace both bridges.
In each case, common (black) should be on 3.
Always replace output diodes as a pair.
Test 4 – Inverter temperature sensor
Symptom: Fault code 0-40 appears in the operator screen.
Remove power and allow the system to reach room temperature (at least 60 minutes after use).
If the system has a temperature interlock, either fault code 0-40 or fault code 0-99 appears on the operator screen.
Display the service screen and check the “F” field for the live (most recent) fault code. Fault code 0-40 appears on the
operator screen, but you need to identify the specific 0-40 fault code variation:
0-40-2 Inverter module under temperature.
0-40-3 Inverter module over temperature.
If fault code 0-99 appears on the operator screen, display the service screen and check the “F” field for:
2-10-0 Inverter module temperature sensor open.
2-10-1 Inverter module temperature sensor shorted.
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