24
ERROR TYPE
(Warning,
Blocking,
Lockout)
DESCRIPTION
ERROR CODE
(OpenTherm)
SYSTEM (FLAME, FAN, HYDRAULIC, ETC.)
B Blocking due to no CH water ow 50
B Low water pressure 51
W No ame signal at start (restart) 52
W
Flameloss during operation => endless restarts
(Parameter “endless restarts” activated)
53
L
Flameloss during operation,
=> Lockout after restarts attempts are used
(Parameter “endless restarts” deactivated)
54
W Flameloss during stabilisation => restart attempts 55
L
Flameloss during stabilisation
=> Lockout after restarts attempt are used
56
L False ame (with heat demand) 57
L No ame after restarts 58
B/L Fan speed, stand still check 59
L
Fan speed not achieved, e.g. Pre-purge-test, post-purge-
test etc.
60
B/L Error fan speed during pre-purge (5* restarts => lockout ) 61
W
Error min/max supervision fan speed during operation
(restart)
62
W Warning due to mains overvoltage 63
B Blocking due to mains undervoltage 64
W
Opentherm plus error (communication faulty; no connection
anymore , etc)
65
L Too many remote resets 66
B No water ow indication 67
B PWM pump blocking error (feedback 90%) 68
B PWM pump electrical error (feedback 85%) 69
B HX water ow fault (feedback < min ow rate) 70
B PWM pump dry run error (feedback 80%) 71
B Warning code from pump (feedback 75%) 72
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