16
6. OSO FAULT FINDING GUIDE
No water from
hot taps
Water from taps
is cold
Intermittent
water discharge
Continous
water discharge
Mains supply off
Strainer blocked
Immersion heaters
not switched on
Immersion heater
thermal cutout has
operated
Programmer set to
central heating or
not switched on
Boiler not
working
Cylinder thermal
cut-out has oper-
ated
Motorized valve
not operating cor-
rectly
Reduced expansion
vessel charge
Thermal cutout
failure (note: water
will be hot
Expansion relief
valve not working
properly
Cold water inlet
pressure reducing
valve not working
Temperature and
pressure relief valve
faulty
Check and open stopcock
Turn off water supply, remove and clean strainer
Check and switch on
Check and press reset button
Check and set to Hot water
Check boiler operation. If fault suspected consult in-
staller / boiler manufacturer
Check and press reset button
Check wiring and/or plumbing connections
to motorized valve
Follow instructions 5.2 Intermittent or slow discharge
from tundish
Switch off power to immersion heater(s). When dis-
charge has stopped check thermal controls, replace if
faulty
Check and replace if faulty
Check pressure from valve, if greater
than 3 bar - replace
Drain 10 litres from cylinder and replace valve
Summary of Contents for 1327051
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