Display codes
47
Worcester Commercial Boiler Series – 6720814332 (2019/04)
2
Actual temperature differential between flow and
safety temperature sensor is too high.
▶ 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 operating characteristics and cabling of the pump and
corresponding sensor. Replace the faulty component if necessary.
3
The boiler return temperature sensor has detected
a return temperature higher than 105 °C.
▶ 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
Short circuit in the flow temperature sensor
contacts.
▶ Check the plug of the sensor.
▶ Check the operating characteristics of the boiler by replacing the
sensor.
3
The flow temperature sensor contacts have been
interrupted.
3
The temperature captured by the flow
temperature sensor exceeds 105 °C.
▶ 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 operating characteristics of the pump and the flow
temperature sensor. Replace the faulty component if necessary.
3
The temperature measured by the flue gas sensor
is too high and it is open.
▶ Check the function of the flue gas sensor. Replace if necessary.
▶ Check the boiler for soiling. Carry out a service if necessary.
▶ Check, via the flue inspection elbow, the seating of the flue gas non-
return valve. Check for obstruction.
3
The safety temperature sensor has captured a
temperature in excess of 105 °C.
▶ 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 operating characteristics of the pump and the sensor.
Replace the faulty component if necessary.
3
The contacts for the safety temperature sensor
have shorted or the safety temperature sensor has
detected a temperature higher than 130 °C.
3
The contacts of the safety temperature sensor
have been interrupted.
▶ Check the plug of the sensor.
▶ Check the operating characteristics of the boiler by replacing the
sensor.
3
The temperature measured by a device thermostat
(e.g. maximum or burner thermostat) is too high
and it is open.
▶ Check whether it is possible to achieve sufficient flow in the heating
system.
▶ Check the burner gaskets for flue gas leaks. Replace the faulty burner
gaskets if necessary.
▶ Check the heat exchanger for soiling.
▶ Check the gas/air ratio.
2
The temperature measured by the flow
temperature sensor exceeds 95 °C.
▶ 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 and function of pump and flow temperature
sensor. Replace the faulty component if necessary.
2
The safety temperature sensor has captured a
temperature in excess of 95 °C.
▶ 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 and function of the pump and safety temperature
sensor. Replace the faulty component if necessary.
2
The boiler return temperature sensor has
measured a temperature higher than 95 °C.
▶ 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 and function of the pump and boiler return
temperature sensor. Replace the faulty component if necessary.
Code
Code
type
Designation
Remedy
