Technical Information
150
G 1xxx/G 2xxx
Background information:
Figure 080-11: Circuit Test Path for F24
18 seconds after starting the drain sequence, the electronic will perform an
operational test on the heater relay. The circulation pump is not operating
and no power is applied to the heater relay coil. If 120VAC is registered at
ST5 on the electronic board, then an F24 is logged in memory (see Figure
080-11). When the circulation pump is not operating, the heater relay
contacts are checked. If supply voltage is then applied to the electronic’s
inputs, the fault is registered.
Cause:
Heater relay contacts have fused together.
Remedy:
Replace the heater relay.
Cause:
Moisture in heater relay.
Remedy:
Replace the heater relay.
Cause:
Fault in the plug on the output side of the heater relay.
Contamination or corrosion on the plug of the heater wiring harness can
cause a bridge between contacts, which can reduce the transfer resistance
below a value of 10 megaohms (10MΩ).
Remedy:
1. Disconnect the machine from the power supply.
2. Disconnect plug ST5 from the electronic.
3. Measure the resistance between the lines of the electronic for heater
pressure switch B1/13 (pins 12 and 22 on plug ST5).
4. If the measured resistance value is smaller than 10 megaohms (10MΩ),
then the heater partial wiring harness must be replaced.
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