Installation Instructions

46
Displayed
fault code
System characteris-
tics
Cause Measures
51 No DHW heating Short circuit, outlet
temperature sen-
sor
Check the sensor (see
page 54).
52 Burner blocked Short circuit, flow
sensor
Check connections and
lead; replace sensor if
required.
58 No DHW heating Lead break, cylin-
der temperature
sensor
Check the sensor (see
page 52).
59 No DHW heating Lead break, outlet
temperature sen-
sor
Check the sensor (see
page 54).
5 A Burner blocked Lead break, flow
sensor
Check connections and
lead; replace sensor if
required.
A9 Control mode without
OpenTherm device
Communication
fault OpenTherm
device
Check connections and
lead; replace OpenTherm
device if required.
b0 Burner blocked Short circuit, flue
gas temperature
sensor
Check the sensor (see
page 55).
b8 Burner blocked Lead break, flue
gas temperature
sensor
Check the sensor (see
page 55).
E3 Burner in a fault
state
Fault in safety
chain
Check the temperature
limiter and connecting
leads (see page 53).
Check the control unit,
and replace if required.
E5 Burner blocked Internal fault Check the ionisation elec-
trode and cables.
Press "Reset" (see
page 48).
F0 Burner blocked Internal fault Replace control unit.
F1 Burner in a fault
state
Max. flue gas tem-
perature exceeded
Check heating system fill
level. Check circulation
pump. Vent the system.
Press "Reset" (see
page 48).
Troubleshooting
Fault messages on the display
(cont.)
5609 059 GB