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Block-
Error
ing
code
123
FLUE_OPEN
125
OUTDOOR_ OPEN
126
RETURN_
SHORTED
127
SUPPLY_
SHORTED
129
DHW_ SHORTED
130
FLUE_ SHORTED
132
OUTDOOR_
SHORTED
133
NET_FREQ_
ERROR
134
RESET_BUTTON_
ERROR
135
PHASE_NEUTRAL
_ REVERSED
136
T_EXCHANGE_
BLOCK_ERROR
155
WD_CONFIG_
ERROR
162
FILL_WARNING
Description
Flue sensor open
Outdoor sensor open
Return sensor shorted
Supply sensor shorted
DHW sensor shorted
Flue sensor shorted
Outdoor sensor
shorted
Net freq. error
detected by the
watchdog
Too many resets in a
short time period
Live and neutral of the
main voltage power
supply input are
reversed
Exchange temperature
exceeded 194 ºF (90
ºC).
Watchdog fan
configuration setting
error
Error is generated
immediately when the
pressure drops below
Minimal_Pressure.
Demand has stopped,
but no error needs to
be stored at this time.
E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
Cause
malfunctioning flue
sensor or not
connected
malfunctioning out-
door sensor or not
connected or wrong
CH-mode
programmed
malfunctioning return
sensor or short
circuiting
malfunctioning supply
sensor or short
circuiting
malfunctioning DHW
sensor or short
circuiting
malfunctioning flue
sensor or short
circuiting
malfunctioning
outdoor sensor or
short circuiting
wrong frequency from
power grid or
aggregate
reset too many times
by user or installer
Line voltage (Hot) and
neutral are wrongly
connected
water temperature is
above 194 ºF (90 ºC).
wrongly program-med
BCU or PB
the water pressure is
below the minimum
pressure level
Solving
check connection to BCU
or check resistance NTC
sensor
check connection to BCU
or check resistance NTC
sensor or change CH-
mode
check connection to BCU
or check resistance NTC
sensor
check connection to BCU
or check resistance NTC
sensor
check connection to BCU
or check resistance NTC
sensor
check connection to BCU
or check resistance NTC
sensor
check connection to BCU
or check resistance NTC
sensor
check frequency on the
mains of the boiler (60Hz)
wait or disconnect and
reconnect power supply
change Line voltage (Hot)
and neutral
check the circulator
operation.
check/open all valves that
might restrict water flow
through the unit.
check external system
circulator(s) influencing
the flow through the unit.
check if system resistance
exceeds the spare
capacity of the unit
circulator.
reset BCU or replace BCU
and or display unit
refill the system until the
pressure is above 1 bar or
14.5 psi
117
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