FAULT FINDING
10
FAULT FINDING
GREENSTAR HEATSLAVE II EXTERNAL 12/18, 18/25 & 25/32
6 720 805 212a (07.2013)
MAINTENANCE
Problem Cause Remedy
Switch off boiler at master
switch, wait a few
seconds then switch on
again
Check setting
Check programmer
settings
Desired room temperature
is not reached
Thermostatic radiator
valve(s) set too low
Room thermostat set too Increase room thermostat
low setting
Temperature control for
CH flow on boiler set too
low
Air trapped in heating
system
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
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
Increase thermostatic
radiator valve setting(s)
Increase CH flow
temperature control
setting
Turn down thermostatic
radiator valves / room stat
Check setting
Bleed radiators and
recharge heating system
if system pressure is low
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