These fault finding charts are provided to assist
competent and suitably qualified engineers to locate
and rectify faults. Whilst every effort has been taken
to ensure the information given is correct and
complete we cannot guarantee that every
eventuality has been covered.
Worcester, Bosch Group cannot be held
responsible for costs incurred by persons not
deemed to be competent.
FAULT FINDING
& DIAGRAMS
FAULT FINDING
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR UTILITY 32/50 & 50/708 716
109 711B 07.2010
48
FAULT FINDING LOGIC FOR
535 SE/LD RDB CONTROL BOX
All resistance measurements are actual measured values and some variation is to be expected, therefore measured
values should be similar to but not necessarily identical to the given values.
The operation of the photo cell can be tested by measuring the resistance across the photo cell, it should be a high
resistance (greater than 10MΩ or open circuit) in the dark and low resistance (3kΩ or less) in light.
Burners on balanced flue systems can recirculate flue products resulting in the burner cycling, if this happens check the
flue system integrity and the terminal position.
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