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Fault Finding Guide7
7.5 Excessive Hot Water from Taps
20
No
Yes
Yes
Yes
Yes
No
No
No
Is cylinder
Thermostat set
too high?
Is system wiring
correct?
Is Cylinder
Thermostat
Operating?
Replace
Cylinder
thermostat
Does Motorised
Valve close when
Thermostat is
satisfied?
Fault.
Contact Engineer
Test for correct operation. If water is still too
hot, contact a competent Engineer
Repair or Replace
Motorised Valve
Check wiring
on cylinder
Thermostat
Excessive Hot Water from Taps
Reduce
Thermostat
Setting
Correct wiring
as per
instructions