Technical Information
158
G 1xxx/G 2xxx
Cause:
Circulation pump stiff and not turning freely.
Remedy:
Clean the circulation pump and remove any foreign objects that may be
present.
Cause:
Speed sensor defective.
Remedy:
Replace the speed sensor; see Section 050-4.21.
Cause:
Circulation pump capacitor defective.
Remedy:
Check the circulation pump capacitor and replace it if necessary; see Section
050-4.19.
3.34 Fault Code F68: Circulation Pump Operating After Shutoff
Symptom:
The program is interrupted and the drain pump is operated.
See Table 080-3 for other model-specific fault indications.
Background information: The speed sensor registers that the circulation
pump is still operating even after it has been switched off.
The frequency converter of the pump registers a speed signal from the
electronic, so a target speed is set.
Cause:
Speed sensor defective.
Remedy:
1. Check connectors to circulation pump speed sensor and electronic.
2. Perform a continuity check to ensure that there is no open circuit.
3. Replace the speed sensor (Section 050-4.21) and perform an operational
check.
Cause:
Electronic defective.
Remedy:
If the fault is still displayed after the speed sensor has been replaced, then
replace the electronic. See Section 100-4.5 or 100-4.6.
3.35 Fault Code F69: Circulation Pump Blocked
Symptom:
The program is interrupted and the drain pump is operated.
See Table 080-3 for other model-specific fault indications.
With the circulation pump operating, the heater pressure switch contacts are
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