Blocking messages
A blocking message is identified by a permanently illuminated letter on the status display. Once the blocking
has been solved, the appliance will start up again automatically. So resetting is not necessary. The possible
causes are described below in order of probability. Also look for the malfunction in this order.
Status
display
CH water
display
Diagnoses
Cause
c
HH
CH flow temperature > 118°C.
(access through submenu sensor values in
the installer program)
•
Connector K4 loose or improperly
connected
•
Temperature sensor wiring
interrupted. For the sensor wiring
connection to connector K4 see the
diagram in the appendix.
•
Sensor defective
•
Control unit defective
LL
CH flow temperature < -10°C
(access through submenu sensor values in
the installer program)
•
Short circuit in temperature wiring
•
Sensor defective
•
Control unit defective
C
Appliance blocked because CH system
pressure is too low
•
CH pressure lower than 1 bar
F
Mains frequency error
•
If this blocking occurs frequently or
for a long period, replace control unit
H
Internal error (control unit)
•
If this blocking occurs frequently or
for a long period, replace control unit
L
Electrical mains supply
•
Mains supply has wrong polarity
•
Not earthed
•
Ionisation electrode earth wire loose
•
Control unit defective
n
Mains or reference voltage too low
•
Mains voltage < 200 Volts
•
Mains voltage insufficient
•
Control unit defective
HH
Appliance type recognition error; value >
118°C
•
Control unit selected incorrectly
•
Selection resistance defective
•
Control unit defective
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 24/33
50
Appliance type recognition error; control unit
is set to CombinAir
60
Appliance type recognition error; control unit
is set to CombinAirCool
