Fault Finding - Bosch Worcester 14/19CBI Installation And Servicing Instructions

Wall mounted boilers for central heating and indirect supply of domestic hot water
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19. Fault Finding

NOTE: This fault finding information is for guidance only. Worcester, Bosch Group cannot be held responsible for costs incurred by
persons not deemed to be competent.
The electronic control for this boiler incorporates three lights: Boiler demand, flame on and lockout.
These form the basis for this fault finding guide.
To use this guide, select box below which represents the light situation during your fault, then refer to the appropriate section.
This guide assumes a component failure has occured following a period of normal running. It is not intended to solve installation errors.
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.
WARNING: In addition to the controls, the overheat thermostat and fan are connected directly to the permanent live supply. Under
all circumstances remove the permanent live supply before touching these parts.
LIGHT SITUATION DURING FAULT
WITH A SYSTEM BOILER DEMAND AND USER CONTROL SET TO MAXIMUM:
DEMAND LIGHT ONLY
ON OR OFF
ON OR OFF
OTHER FAULTS NOT COVERED BY ABOVE
NO LIGHTS AT ALL
BURNER LIGHT ONLY
LOCKOUT LIGHT ON
OFF
CONSTANTLY
LOCKOUT LIGHT
OFF
35
FAULT POINT A
FAULT POINT B
FAULT POINT C
FAULT POINT D
FAULT POINT E
FLASHING
FAULT POINT F

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19/24cbiWorcester 9/14cbiWorcester 19/24cbi

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