Fault Finding - Worcester GREENSTAR HEATSLAVE12/18 User Instructions

8 716 106 253f 30/3/10
Problem
Desired room temperature
is not reached
Desired room temperature
exceeded by large amount
Temperature rises instead
of falling
No display or display unit
does not respond
Hot water temperature too
low
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Cause
Thermostatic radiator
valve(s) set too low
Room thermostat set too
low
Temperature control for
CH flow on boiler set too
low
Air trapped in heating
system
Radiators are too hot
Clock is incorrectly set
Momentary power failure
Hot water temperature set
too low
Hot water not in timed
period on the programmer
Heatslave tank not up to
temperature
GREENSTAR HEATSLAVE 12/18 - 18/25 - 25/32
8 716 106 253f (03.2010)

FAULT FINDING

Remedy
Increase thermostatic
radiator valve setting(s)
Increase room thermostat
setting
Increase CH flow
temperature control
setting
Bleed radiators, if fitted to
a sealed system recharge
heating system
Turn down thermostatic
radiator valves / room stat
Check setting
Switch off boiler at master
switch, wait a few
seconds then switch on
again
Check hot water
temperature control
setting
Check programmer
settings
Allow time for Heatslave
tank to reach temperature
FAULT FINDING
9