Display codes
Worcester Commercial Boiler Series – 6720814332 (2019/04)
46
The boiler waits after DHW operation ends.
3
The KIM is too new for the burner control unit.
▶ Replace the burner control unit with a model on which the most up-
to-date version of the software is installed. The software version is
specified on the barcode of the burner control unit.
3
The KIM that has been fitted is not compatible with
the burner control unit.
▶ Check the KIM number.
▶ Fit a KIM with the correct KIM number.
3
The burner control unit that has been fitted is not
compatible with the KIM.
▶ Check the numbers on the burner control unit.
▶ Fit a KIM with the correct KIM number.
3
The burner control unit or the KIM is faulty.
▶ Check plug and wiring of the burner control unit.
▶ Check the operating characteristics of the boiler by replacing the
burner control unit.
3
Short circuit in the flue gas temperature sensor
contacts.
▶ Check the function of the flue gas temperature sensor by replacing
the component.
3
The burner control unit or the KIM is faulty.
▶ Check plug and wiring of the burner control unit.
▶ Check the operating characteristics of the boiler by replacing the
burner control unit.
2
No control signal or power supply to the fan during
operation.
▶ Check plug and cabling of the fan.
▶ Check the function of the fan, replace the component if necessary.
2
The boiler was switched off for a maximum of
2 minutes because it had been operating
continuously for more than 24 hours. This is a
safety check.
3
The fan speed is too high.
▶ Check plug and cabling of the fan.
▶ Check the operating characteristics of the boiler by replacing the fan.
▶ Check the plug of the burner control unit.
▶ Check the operating characteristics of the boiler by replacing the
burner control unit.
3
The fan speed is too low.
3
The fan does not run during the start phase (
).
3
The fan speed is irregular when starting up.
2
Water pressure is too low.
▶ Top up heating system with water until a pressure of 2 bar is reached.
▶ Check the expansion vessel.
▶ Check the heating system for leaks.
▶ Check the wiring and function of the pressure sensor.
3
Pump test failed.
▶ Check the water pressure of the boiler, vent the heating system and
the boiler.
▶ Check whether it is possible to achieve sufficient flow in the heating
system.
▶ Check function of the pump.
▶ Check function and cabling of the pressure sensor.
▶ Check the operating characteristics of the boiler by replacing the
faulty component.
3
The contacts of the boiler return temperature
sensor have short-circuited.
▶ Check the water pressure of the boiler, vent the heating system and
the boiler.
▶ Check whether it is possible to achieve sufficient flow in the heating
system.
▶ Check plug and cabling of the boiler return temperature sensor.
▶ Check the function of the boiler by replacing the boiler return
temperature sensor.
3
The contacts of the boiler return temperature
sensor have been interrupted.
The external switching contact has opened.
▶ Check the jumper at the connection of the external switching
contact.
▶ Check the external switching contact.
The actual temperature recorded by the flow
temperature sensor or return temperature sensor
is rising too quickly.
▶ Check the water pressure of the boiler, vent the heating system and
the boiler.
▶ Check whether it is possible to achieve sufficient flow in the heating
system.
▶ Check the cabling to the pump and corresponding sensors. Replace
the faulty component if necessary.
Code
Code
type
Designation
Remedy
