BASIC TROUBLE SHOOTING
Symptoms
Possible Cause
Remedy
No boiling water
available
Broken tap top
Element failed or tripped
Over-boil cutout tripped
Defective Printed Circuit Board
Replace tap top (or component)
Replace element or reset trip
Reset trip device
Replace Circuit Board
Overboiling
Excessive internal scale. (See
‘De-Scale’ page 23)
Faulty wiring to thermistor /
faulty thermistor
Temperature controller needs
adjusting
Element failed to earth
Defective Printed Circuit Board
De-scale the boiler
(Particularly thermistor)
Repair / replace as required
Lower operating temperature
Replace element
Replace Circuit Board
Overflows
Dirt in solenoid valve.
Level sensors require de-
scaling or replacing
Defective Printed Circuit Board
Clean solenoid filter or replace
solenoid, “work the boiler” -
see Service Instructions.
De-scale / replace sensors
Replace Circuit board
THERMAL CUTOUT DEVICES.
The HT3C10, HT3C20 and HT6C20 boilers have an inbuilt thermal
cutout device to protect the element in a boil dry situation. They also
feature an inline thermal cutout device on the vent / overflow pipework
to detect and cut power in the event of an over-boil situation. Should
either cutout be activated, contact our service department or an
approved Calomax service provider for advice.
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