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8 Troubleshooting
If a fault occurs in the heating system, all of the operating mode
symbols flash and the fault is shown in the display. Faults can be fixed
as follows.
8.1 Procedure
1. Look for the displayed fault's cause and remedy in Table 8/1 -
Faults.
2. Fix the fault, or have it fixed.
3. Acknowledge the fault with the Enter button.
4. For faults which affect safety, switch the main switch off and back
on again after waiting several seconds.
✓ The symbol for the current operating mode lights up.
✓ The fault message is no longer shown in the display.
✓ The fault is fixed.
8.2 Possible faults
No. Fault Cause Remedy
Mains switch is
turned on but
the indicator in
the switch does
not light up
• Circuit breaker of the mains
supply is turned off
• Mains supply is not
connected
• Microfuse underneath the
mains switch is faulty
• Switch on the circuit breaker
of the mains supply
• Have the mains supply
connected by a qualified
electrician
• Exchange the microfuse
F001 Safety
thermostat
• Excessive boiler temperature
or the wiring is faulty
• Fuse F2 (on I/O circuit board)
faulty
• Have the fault fixed by a
qualified electrician
Table 8/1 - Faults
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