0 – 0.5
BAR
•
Central heating system lacking water
pressure
•
No venting of the central heating
system through the automatic de-
aerator
•
Leak in the appliance or central
heating system
•
Central heating pressure sensor
defective
c
Central heating water pressure too low
or too high. Limiting the output to the
appliances lowest capacity. The
current central heating water pressure
is shown on the central heating
display. If the central heating water
temperature is set on the central
heating display, the current central
heating water pressure can be read
through ‘sub-program sensor values’
3 – 4 BAR
•
Central heating system over
pressurised
•
Expansion tank defective
•
Central heating pressure sensor
defective
H H
•
See cause of HH in status message
d
Central heating return temperature
<-10
o
C or >118
o
C. In sub-program
sensor values, HH (>118
o
C) or LL (<-
10
o
C) will appear on the central
heating water display.
L L
•
See cause of LL in status message
H H
•
See cause of HH in status message
h
Outside temperature<-10
o
C or >118
o
C.
In sub-program sensor values,
HH (>118
o
C) or LL (<-10
o
C) will
appear on the central heating water
display.
L L
•
See cause of LL in status message
3.2 Blocking messages
A blocking message is identified by a permanently illuminated letter on the diagnostic 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.
Code
Diagnosis
Cause
Diagnostic
display
Central heating
water display
c H
H
Central heating water temperature > 118°C
•
See cause of HH in ‘status message/b’ [3.1]
L
L
Central heating water temperature < -10°C
•
See cause of LL in ‘status message/b’ [3.1]
C*
Appliance blocked because central heating
system pressure is too low
•
Central heating 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
•
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
n
Mains or reference voltage too low
•
Mains voltage < 200 volts
•
Mains voltage insufficient
•
Control
unit
t H
H
Appliance type recognition error, value >
118°C
•
Control unit selected incorrectly
•
Selection resistance defective
•
Control unit defective
L
L
Appliance type recognition error, value < -
10°C
1
0
Appliance type recognition error, the control
unit is set to 24/80
1
1
Appliance type recognition error, the control
unit is set to 24/80
plus
2
0
Appliance type recognition error, the control
unit is set to 32/80
2
1
Appliance type recognition error, the control
unit is set to 32/80
plus
* this code will not be stored in the memory
ATMOS MULTI Mk2 version 2004
Appendix Page 13
Summary of Contents for Multi Mk2
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