Display codes
45
Worcester Commercial Boiler Series – 6720814332 (2019/04)
Table 17 Inspection and maintenance reports
12
Display codes
Display codes give an indication of the operating condition of the boiler.
Fault codes are either shown in the display directly or can be called up via
the information menu. Proceed as follows:
▶ Open the information menu (
Chapter 7.1).
▶ Switch to the fault code level in the information menu.
▶ Read out the fault code and look up meaning (
12.1
Code types in the display
There are 3 types of code:
▶ – Normal operating code
▶
2
Blocking fault code
▶
3
Interlocking fault code
12.2
Reset
For safety reasons, the boiler shuts down and locks as soon as a serious
fault occurs. The fault code flashes to indicate this. The boiler must be
reset in order to unlock it. Proceed as follows:
▶ Press the “reset” key (
figure 61, [2], page 31), until “rE” appears
in the display.
Generally, the boiler will operate normally again after a reset.
However, in some cases the underlying fault must first be remedied.
12.3
Operating and fault codes
Confirm correct inspection
Company stamp/signature/date
Inspection work
Date:
___________
Date:
___________
Date:
___________
Date:
___________
Date:
___________
Date:
___________
Code
Code
type
Designation
Remedy
The boiler is in chimney sweep mode.
The boiler is in heating mode.
The boiler is in DHW mode.
The boiler is waiting. There was a heat demand
from the on/off or modulating control more
frequently than 1x every 10 minutes.
The boiler is on standby.
The boiler is waiting. The actual flow temperature
is higher than the calculated or selected boiler
temperature.
▶ Check the boiler temperature on the boiler display. Increase the
above if necessary.
▶ Check the heating curve that has been set once the weather-
dependent control has been adjusted. Increase the above if
necessary.
▶ Check the wiring and function of the cylinder temperature sensor.
Replace the component if necessary.
The actual temperature recorded by the flow
temperature sensor or the safety 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 operating characteristics and cabling of the pump and
corresponding sensor. Replace the component if necessary.
3
Diagnosis tool was connected.
The flow temperature sensor is not detecting a rise
in temperature following a burner start.
▶ 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 operating characteristics of the pump and the
flow temperature sensor. Replace the component if necessary.
The boiler is waiting. In response to a heat
demand, the boiler regularly switches to partial
load.
Component test phase.
The boiler is modulating upwards.
The boiler is preparing for a burner start. The fan
and pump are activated.
The gas valve is switched.
