Worcester 24CDi Installation And Servicing Instructions

31
No lights at all
Other faults not covered by above
FAIL POINT C FAIL POINT B
FAIL POINT E
FAIL POINT J
FAIL POINT K
FAIL POINT A
FAIL POINT D
FAIL POINT F
FAIL POINT G
FAIL POINT H
FAIL POINT I
No green light
(Red lights work)
No light
(Other lights work)
Light on constant
(CH knob in OFF
position)
2 lights flashing slowly
Flashing slow
Flashing fast Flashing fast
No light
(Other lights work)
No red lights
(Green light working)
LIGHT SITUATION DURING FAULT
POWER ON
(Green)
CH DEMAND
(Red)
HW DEMAND
(Red)
BURNER ON
(Red)
Note: This fault-finding information is for guidance only. Worcester Heat Systems cannot be held responsible for costs incurred by
persons not deemed to be competent.
The electronic control system for this boiler incorporates four lights on the facia. These are used to show normal operating status. But as
a secondary function, by flashing, they can also be used to help provide fault diagnostics. Therefore, with individual or groups of lights
being permanently off, on or flashing, every normal fault can be identified.
To use the fault finding system, select a box below which represents the light situation during your fault. Then refer to the appropriate
following section. This fault-finding system assumes that the appliance has been operating correctly until the time of failure.
PRELIMINARY CHECKS
Preliminary electrical system checks are the first electrical checks to be carried out during a fault-finding procedure. On completion of
the Service/Fault-Finding task which has required the breaking and remaking of electrical connections, check (a) EARTH CONTINUITY,
(b) SHORT CIRCUIT CHECK, (c) POLARITY and (d) RESISTANCE TO EARTH.
Note:
Slow flash is once per second, fast flash is five times per second.
Slow flash can only be cleared by using the facia reset button (press for at least one second).
Fast flash is cleared by removing fault and/or main switch off/on.
19. Fault Finding
No green light
(Red lights function)
No red light
(other lights function in other modes)
No red light
(other lights function in other modes)
No red lights
(Green light functions)

Worcester 24CDi Specifications

General

Model	24CDi
Output	24 kW
Efficiency Rating	A
Max Working Pressure	3 bar
Central Heating Flow Temperature Range	30 - 80 °C
Fuel Type	Natural Gas
Mounting	Wall Mounted