User Manual

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Building Technologies CC1N7491.1en
03.04.2018
Error code list (cont’d)
QAA73
display of error
code
(depending
on LMU34 type)
Meaning of QAA73 text display
Internal
diagno
stics
code
Cause
Error 156 Error supply voltage 20
Undervoltage fault (burner control start
prevention)
Error 156 Error supply voltage 21
Undervoltage fault (indication, no start
prevention)
Error 156 Error supply voltage 22
Over Voltage Fault (indication, no start
prevention)
Error 158 Error condensate 0 Condensate pump continuous operation
Error 160 Fan speed threshold not reached 20
Under run of minimum fan speed thresh-
old, wrong air supply, retry
Error 160 Fan speed threshold not reached 21
5 times under run of minimum fan speed
threshold, wrong air supply, retry after 2
hour
Error 160 Fan speed threshold not reached 22
Fan speed on standstill in standby not
reached
Error 160 Fan speed threshold not reached 23
Fan speed threshold in ignition phase not
reached
Error 160 Fan speed threshold not reached 24
Fan speed threshold in ignition phase with
delayed restart not reached
Error 160 Fan speed threshold not reached 25 Ignition fan speed threshold not reached
Error 161 Maximum fan speed exceeded 20
Exceeding of maximum fan speed NoG-
max
Error 164 Error heating circuit flow / pressure switch 1
Pump OFF, but flow / pressure switch does
not open
Error 164 Error heating circuit flow / pressure switch 2
Pump ON, but flow / pressure switch does
not close
Error 167 Heating power limit exceeded / under run 20
Exceeding maximum heat capacity in op-
erating mode
Error 167 Heating power limit exceeded / under run 21
Under run minimum heat capacity in oper-
ating mode
Error 168 Lockout of device active 0 Burner control communication timeout
Error 180 Chimney sweep function active 0 --
Error 181 Regulator stop function active 0 --
Error 183 Test mode active 20 Test mode 1 active
Error 183 Test mode active 21 Test mode 2 active
Error 193 Flatness test 1 failed 20 Flatness test 1 failed