FAULT FINDING AND DIAGNOSIS
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8 FAULT FINDING AND DIAGNOSIS
Basic checks
• Ensure that there is 230V power supply and the polarity is correct to
the appliance.
• Ensure that the appliance settings and functionality is correct.
• Ensure the CH/DHW programmer/timer is functioning.
• Ensure the room thermostat is functioning.
• Ensure the cylinder thermostat (if fitted) is functioning.
• Ensure the cold water mains is turned on?
• Ensure the primary system has adequate pressure/system content
for the system type.
• Ensure there is gas to the appliance?
– Are other gas appliances working, gas cooker/hob for example?
– Has the credit run out on the gas pre-payment meter?
This fault finding information is for guidance only.
Worcester cannot be held responsible for costs incurred
by persons not deemed to be competent.
This fault finding system assumes that the appliance has
been operating normally until the time of failure (i.e. not
a first time installation error).
NOTICE:
On completion of the Service/Fault-Finding task which
has required the breaking and remaking of electrical
connections, check:
▶ Earth continuity,
▶Short circuit check,
▶Polarity
▶ Resistance to earth.
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