TECHNICAL ASSISTANCE SERVICE
55
Error
code via
QAA
Diagnostic
info
Description of error
Type of fault
System action
Procedure
154
427
Generic error
The reset criterion for
error 426 has not been
reached (criterion:
boiler temperature <
boiler setpoint and dT <
dTkTrSTB)
Safety shutdown
OEM parameter not
editable via QAA.
Generic error. Check
the system. Boiler
temperature rises too
quickly
154
433
Generic error
dT is > dT 16K
Safety shutdown
OEM parameter not
editable via QAA.
Generic error. Check the
system. The temperature
differential in the boiler is
excessive
154
434
Generic error
The reset criterion for
error 433 has not been
reached (criterion: dT <
½ dTkTrSTB)
Safety shutdown
OEM parameter not
editable via QAA.
Generic error. Check the
system. The temperature
differential in the boiler is
excessive
154
435
Generic error
Error 433 has occurred
more times than
permitted by the burner
parameter GrenzeDeltaT
Burner lockout
(permanent). Lockout
reset required
OEM parameter not
editable via QAA.
Generic error. Check the
system. The temperature
differential in the boiler is
excessive
154
474
Generic error
The DHW setpoint for
HMI is < TbwSmin
Message
OEM parameter 508,
editable via password.
Check the DHW system;
temperature too low
154
475
Generic error
The DHW setpoint for
HMI is > TbwSmax
Message
OEM parameter 508,
editable via password.
Check the DHW system;
temperature too low
154
476
Generic error
HMI flow temperature is
< TkSmin
Message
Installer parameter 503.
Check system, boiler
setpoint
154
477
Generic error
HMI flow temperature is
> TkSnorm
Message
Installer parameter 505.
Check system, boiler
setpoint
154
478
Generic error
HMI room temperature
setpoint is < TrSim
Message
Installer parameter 501.
Check system, zone
setpoint
154
479
Generic error
HMI room temperature
setpoint is > TrSim
Message
Installer parameter 501.
Check system, zone
setpoint
154
498
Generic error
Water schematic with CH
circuit 2 and room unit
unavailable
Message
Check HMI programming
160
83
Fan speed threshold not
reached
The acceptable speed
range for starting the
ignition sequence was
not reached during
start-up
Burner lockout
(permanent). Lockout
reset required
Contact Technical
Assistance Service
160
281
Fan speed threshold not
reached
Fan speed is below
required threshold,
phase Ph_TLO: (N_
TL-N_TH_Delta), phase
Ph_TNN: NoG_Null.
Burner lockout
(permanent). Lockout
reset required
OEM parameter not
editable via QAA. Fan
differentials exceeded.
Contact Technical
Assistance Service
160
282
Fan speed threshold not
reached
Speed thresholds
exceeded, PH_THL1_1:
(N_Vor - N_Vor_Delta),
PH_THL1_2: (N_ZL - N_
ZL_Delta), PH_THL2_2:
(N_Vor - N_Vor_Delta).
Burner lockout
(permanent). Lockout
reset required
OEM parameter not
editable via QAA. Fan
differentials exceeded.
Contact Technical
Assistance Service
161
110
Maximum fan speed
exceeded
Maximum fan speed
exceeded
Burner lockout
(permanent). Lockout
reset required
OEM parameter not
editable via QAA. Fan
differentials exceeded.
Contact Technical
Assistance Service
