Table of Contents
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No display at solar differential
temperature controller
NO
Is the 230/240V~ power
supply correctly wired
YES
NO
Is the 230/240V~ power
supply switched on
YES
Has thermal cutout
YES
on cylinder operated
(unvented systems only)
NO
Is the 230/240V~
NO
power supply at the controller
terminal block
YES
NO
Is internal
fuse operational
YES
Controller fault
Replace controller
Correct any wiring faults
Switch on power supply
Reset thermal cutout.
Investigate cause of operation
and rectify
Check wiring and rectify
Replace internal fuse
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