Heat exchanger antifreeze active, as fan speed variation is too high. Appliance is
within the waiting time of the operation block function
No heating demand from low voltage controls (clamp 7-8-9)
Response from accessory module or defective condensate pump is blocking
burner operation
Appliance is within the waiting period of the operation block function due to water
shortage (VL-RL spread too big)
Appliance is within the waiting period of the operation block function due to water
shortage (temperature gradient)
Return-sensor check is running, demand (DHW or heating) is blocked
Flow-/Return-sensor check is running, demand (DHW or heating) is blocked
10.1.2 Diagnostic codes
In the diagnostic mode, you can change certain parameters or display more information. The
diagnostic information is divided into two diagnostic levels. The second diagnostic level can be
reached only after entering a password.
CAUTION:
Access to the second diagnostic level must be used exclusively by a qualified technician.
First Diagnostic level
● Press the “i” and “+” keys simultaneously. The display shows “d.0”.
● Use the “+” or “–” keys to scroll through the desired diagnostic numbers of the first
diagnostic level (see table 10.2).
● Press the “i” key. The display shows the relevant diagnostic information.
● If necessary, use the “+” or “–” keys to change the value (display flashes).
● Save the new value by holding down the “i” key for approx. 5 seconds until the display
no longer flashes. You can end the diagnostic mode as follows:• Press the “i” and “+”
keys simultaneously.
● Do not press any key for approx. 4 minutes.
The current heating flow temperature appears in the display again.
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