Table of Contents
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9 Troubleshooting
Error code
03
04
05
06
07
08
09
10
11
12
14
16
17
34
35
36
37
38
39
40
41
9.2
Accessing the error memory
Fig.49
MW-2000369-1
Fig.50
Fig.51
54
Description
Flow temperature sensor open
Temperature of heat exchanger too low
Temperature of heat exchanger too high
Return temperature sensor short-circuited
Open circuit in return temperature sensor
Return temperature too low
Return temperature too high
Difference between the flow and return temperatures too high
Heat exchanger temperature outside of the normal range (STB safety thermostat)
Five failed burner starts
False flame signal
Defective gas valve
Defective fan
Flow and return reversed
5x flame loss
Communication fault
Communication error with the PCB
Blocking input in locked-out mode
If present: Test error in HRU/WTW unit
Maximum temperature of the control unit exceeded
The error and fault codes are listed together in the memory.
1. Access the menus by pressing the two keys on the right
simultaneously.
2. Select the Malfunction menu
3. Select the PCB by pressing the
Confirm the PCB selection by pressing the
appears.
Important
The Er:xxx parameter flashes. 000 corresponds to the number of
stored errors.
4. Go to the error details by pressing the
5. Scroll through the errors by pressing the
opens, the row of the error in the memory appears briefly. The PCB
name appears. Go back to the error list by pressing the
Important
The errors are stored from the most recent to the oldest.
by pressing the
key.
or
key. The
icon appears.
key: the PCB name
key.
or
key. When this menu
7611444 - v06 - 04032019
key.
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Table of Contents
Troubleshooting
