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Blocking
Error
code
122
T DHW Open
123
T Flue Open
125
T Outdoor Open
126
T Return Shorted
127
T Supply Shorted
129
T DHW Shorted
130
T Flue Shorted
132
T Outdoor Shorted
134
Reset Button Error
136
T_Exchange Block
Error
155
WD Config Error
162
Fill Warning
164
Ex. Low Flow
Protection
Description
DHW sensor open
Or
Cascade System: Depending
boilers parameter 35 "DHW
Mode" not changed to 0
Flue sensor open
Outdoor sensor open
Return sensor shorted
Supply sensor shorted
DHW sensor shorted
Flue sensor shorted
Outdoor sensor shorted
Too many resets in a short
time period
Exchange temperature ex-
ceeded 194 ºF (90 ºC).
Watchdog fan configuration
setting error
Error is generated immediately
when the pressure drops be-
low Minimal_Pressure. De-
mand has stopped, but no er-
ror needs to be stored at this
time.
Flow is too low, demand needs
to be stopped with fan at igni-
tion speed*, but no error
needed to be stored at this
time
E93.1804.014
Cause
Solving
malfunctioning DHW
check connection to BCU or
sensor or not con-
check resistance NTC sensor
nected
OR
Modify parameter 35 (DHW
Mode) to 0 of depending boil-
ers only
malfunctioning flue
check connection to BCU or
sensor or not con-
check resistance NTC sensor
nected
malfunctioning out-
check connection to BCU or
door sensor or not
check resistance NTC sensor
connected or wrong
or change CH-mode
CH-mode pro-
grammed
malfunctioning re-
check connection to BCU or
turn sensor or short
check resistance NTC sensor
circuiting
malfunctioning sup-
check connection to BCU or
ply sensor or short
check resistance NTC sensor
circuiting
malfunctioning DHW
check connection to BCU or
sensor or short cir-
check resistance NTC sensor
cuiting
malfunctioning Flue
check connection to BCU or
sensor or short cir-
check resistance NTC sensor
cuiting
malfunctioning Out-
check connection to BCU or
door sensor or short
check resistance NTC sensor
circuiting
Reset many times by
wait or disconnect and recon-
user or installer
nect power supply
water temperature is
Check pump functioning.
above 194 ºF (90 °C).
Check/open all valves that
might restrict water flow
through the unit. Check ex-
ternal system pump(s) that
influences flow through the
unit. Check if the system re-
sistance exceeds the spare
capacity of the unit pump.
wrongly pro-
reset BCU or replace BCU and
grammed BCU or PB
or display unit
The water pressure is
refill the system until the
below the minimum
pressure is above 1 Bar.
pressure level
not enough water
Check functioning of the
flow through heat
pump. Check/open all valves
exchanger
that might restrict the water
flow through the unit.
Check for an external system
pump that influences flow
through the unit.
Check if the system resistance
exceeds the spare capacity of
the unit pump.
99
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