FAULT FINDING LOGIC FOR
SATRONIC CONTROL BOX
Note: This chart assumes all wiring within the control box base is correct, if in doubt check the wiring against the diagram on
the base of the control box before replacing any components.
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 (15kΩ 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.
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.
Measure all 230V tests between
Neutral (N) and the pin, wire or
terminal specified.
FAULT FINDING
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 106 252b (07/06
46
FAULT FINDING
& DIAGRAMS
