Eco-King HWB-299, Installation And Service Manual

Page: 91 / 124

E93.1801EN171 HWB installation manual 91
Lock-
out
code
Error Description Cause Solving
116 LOW_WA-
TER_PRES-
SURE_SENSOR
Low water pressure, gener-
ated when the pressure
drops below Minimal_Pres-
sure, or when the pressure
drops below 4.5 PSI. Not enough water
pressure Fill up the system and
check if there are any wa-
ter leakages
118 WD_COMM_ER-
ROR
Watchdog communication
error wrong program-
med BCU or PB reset BCU or replace BCU
and or display unit
119 RETURN_OPEN Return sensor open malfunctioning re-
turn sensor or not
connected check connection to BCU
or check resistance NTC
sensor
120 SUPPLY_OPEN Supply sensor open malfunctioning
supply sensor or
not connected check connection to BCU
or check resistance NTC
sensor
122 DHW_OPEN DHW sensor open malfunctioning
DHW sensor or
not connected check connection to BCU
or check resistance NTC
sensor
123 FLUE_OPEN Flue sensor open malfunctioning flue
sensor or not con-
nected check connection to BCU
or check resistance NTC
sensor
125 OUT-
DOOR_OPEN
Outdoor sensor open malfunctioning out-
door sensor or not
connected or
wrong CH-mode
programmed check connection to BCU
or check resistance NTC
sensor or change CH-
mode
126 RE-
TURN_SHORTE
D
Return sensor shorted malfunctioning re-
turn sensor or
short circuiting check connection to BCU
or check resistance NTC
sensor
127 SUP-
PLY_SHORTED
Supply sensor shorted malfunctioning
supply sensor or
short circuiting check connection to BCU
or check resistance NTC
sensor
129 DHW_SHORTE
D
DHW sensor shorted malfunctioning
DHW sensor or
short circuiting check connection to BCU
or check resistance NTC
sensor
130 FLUE_SHORTE
D
Flue sensor shorted malfunctioning
Flue sensor or
short circuiting check connection to BCU
or check resistance NTC
sensor
132 OUTDOOR_
SHORTED
Outdoor sensor shorted malfunctioning
Outdoor sensor or
short circuiting check connection to BCU
or check resistance NTC
sensor
133 NET_FREQ_ER-
ROR
Net freq. error detected by
the watchdog Wrong frequency
from power grid or
aggregate Check frequency on the
mains of the boiler (60Hz)
134 RESET_BUT-
TON_ ERROR
Too many resets in a short
time period Reset many times
by user or installer wait or disconnect and re-
connect power supply
135 PHASE_NEU-
TRAL_ RE-
VERSED
Live and neutral of the
main voltage power supply
input are reversed Phase and neutral
are wrongly con-
nected Change phase and neutral
136 T_EXCHANGE_
BLOCK_ERROR
Exchange temperature ex-
ceeded 194 ºF (90 ºC). water temperature
is above 194 ºF
(90 °C). Check pump functioning.
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
resistance exceeds the
spare capacity of the unit
pump.