Blocking messages
A blocking is an error that occurs without causing a malfunction. The unit waits until the blocking has been
resolved and then continues to operate normally. A blocking is indicated by a permanently lit letter on the
status display. The sensor value for the sensor that the blocking message refers to, can be displayed in the
CH water display by accessing the submenu sensor values in the installer program.
Status display
code
CH water
display
Diagnosis
c
HH
LL
CH flow temperature sensor error; > 118°C
CH flow temperature sensor error; < -10°C
C
CH water pressure lower than 1 bar
F
Mains frequency error
H
Internal error (control unit)
L
Electrical mains plug error – correct supply polarity
n
Mains or reference voltage too low
HH
Appliance type recognition error; value > 118°C
LL
Appliance type recognition error; value < -10°C
10
Appliance type recognition error; control unit is set to 24/80
11
Appliance type recognition error; control unit is set to 24/80+
20
Appliance type recognition error; control unit is set to 32/80
t
21
Appliance type recognition error; control unit is set to 32/80+
22
Appliance type recognition error; control unit is set to 30/50+
30
Appliance type recognition error; control unit is set to 38/80+
40
Appliance type recognition error; control unit is set to Combipact
50
Appliance type recognition error; control unit is set to CombinAir
60
Appliance type recognition error; control unit is set to CombinAirCool
Malfunction messages
A malfunction is an error which is so serious that the unit is locked. A malfunction message is identified by a
locked control unit accompanied by a flashing number or letter on the status display. The appliance can only
be unlocked by pressing the reset button.
Status display code
CH water
display
Diagnosis
1
Blocking for longer than one hour
2
Fan defective (5 Hz deviation per minute)
3
Incorrect ionisation (flame) signal
3.
No ionisation (flame) signal during start-up procedure
4
Ionisation signal absent during heat supply
4.
Ionisation signal remains present after heat supply
6
Gas valve control defective
7
Insufficient flow of CH water during DHW demand
7.
Insufficient flow of CH water during CH demand
8
Maximum thermostat cuts out and CH water pressure was < 0,5 bar
9
Maximum thermostat cuts out and CH flow sensor was > 80°C
9.
Safety internal malfunction in control unit
Letter
Internal malfunction in control unit
(Dark display)
Appliance receiving no mains power
