Fault Code F25: Target Temperature Fault - Miele G 4205 Technical Information

Technical Information
Cause:
Heater relay contacts have fused together.
Remedy:
Replace the heater relay. See Section 050-4.10.
Cause:
Moisture in heater relay.
Remedy:
Replace the heater relay. See Section 050-4.10.
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.
3.19

Fault Code F25: Target Temperature Fault

Background information: During the heating stage, the desired temperature
has not been reached within the given time (minimum 75 minutes). In
subsequent wash blocks, after this fault has been registered, the heater is not
activated and no rinse aid is dispensed.
Cause:
Heater defective.
Remedy:
Replace the heater. See Section 050-4.14.
Cause:
Heater relay defective.
Remedy:
1. Check the heater relay solenoid.
2. Check the heater relay solenoid voltage (12VDC) from the electronic.
3. Replace the electronic, if necessary. See Section 100-4.5 or 100-4.6.
Cause:
Excess quantity of detergent or rinse aid dispensed. Excess foam has developed.
Excess foam can cause a drop in water flow pressure, directly affecting the heater
pressure switch.
Remedy:
Check the dispensed quantities of detergent and rinse aid. Clean out excess
foam and follow the information given in the operating instructions.
138
G 5xxx