Product specifications

12. Malfunctions.
The Atmos Multi has three types of malfunctions
that can be reported via the diagnostic display, as
follows :-
 Warning report
 Block report
 Malfunction report
 Warning report. A letter appearing on the
diagnostic display for 1 second in every 5 seconds
identifies a warning report. The appliance continues
to operate, but the function to which the report
relates will be switched off or ignored (Table 7).
Table 7: Warning report
Status message
(Number)
8 = status report
Warning
every
5 secs
Message
8 b
Incorrect hot water tank
temperature reading,
value<-10
o
C or> 118
o
C
8 c
Incorrect central heating
water pressure, value
between 0 and 0.5 bar or
3 and 4 bar (capacity is
limited to low setting)
8 d
Incorrect central heating
return sensor reading,
value<-10
o
C or> 118
o
C
8 h
Incorrect outside sensor
reading, value<-15
o
C
or>118
o
C
 Block report. A block is an error that occurs,
without causing a malfunction. The appliance waits
until the block has been resolved and then
continues to operate normally. A block is indicated
by a permanently lit letter on the diagnostic display
(Table 8).
Table 8: Block report
Diagnostic
display
Central
heating
water
display
Message
c HH
Central heating water
temperature sensor error
value >118
o
C
c LL
Central heating water
temperature sensor error,
value <-10
o
C
C*
Central heating pressure
lower than 1 bar (occurs
when the plug is inserted
into the power socket)
F
Mains frequency error
H
Internal error
L
Electrical mains plug error-
correct supply polarity
n
Mains or reference voltage
too low
t
Appliance type recognition
error
 Malfunction report. A malfunction is a fault
that causes the appliance to be shut down by the
control unit and locked. The appliance can only be
unlocked by pressing the 'Reset' button. A flashing
number or letter on the status display indicates a
malfunction (Table 9).
Table 9: Malfunction report
Diagnostic
display
Message
2
Fan defective (5Hz 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 too long
after heat supply stops
6
Gas valve control defective
7
Insufficient flow of central heating water
during hot water heating
7.
Insufficient flow of central heating water
during radiator heating
8
Maximum thermostat cuts out and central
heating water pressure was lower than 0.5
bar
9
Maximum thermostat cuts out and central
heating water sensor was higher than 80
o
C
9.
Safety internal malfunction in control unit
Letter Internal malfunction in control unit
(Dark
display
Appliance receiving no voltage
First attempt to remove the malfunction by pressing
the 'Reset' button once. If the appliance does not
unlock, press the 'Reset' button again after
approximately 15 seconds. For more information.,
refer to the Appendix.
ATMOS MULTI Mk 2 version 2008
Page 48