Fault Finding - Heatrae Sadia Multipoint 75 Fitting Instructions And User Manual

8.17 Remove dust cap from top of Expansion Vessel.
8.18 Check pre-charge pressure using a tyre pressure gauge. If the pressure
is lower than 3.5 bar (51 p.s.i.) it should be recharged using a tyre pump
(Schraeder Valve type). DO NOT OVER CHARGE.
8.19 Re-check pressure and when correct replace dust cap.
8.20 Turn on mains water supply and close hot tap.

9.0 FAULT FINDING

Disconnect the electrical supply before removing the terminal cover. It is
recommended that any service operations on the Multipoint heater are carried
out by a competent person.
FAULT
Water not heating
Discharge of water from
pressure relief valve
(continuously).
Discharge of water from
pressure relief valve
(intermittently).
Discharge of water from
Temperature/Pressure
relief valve and/or
water/steam from
pressure relief valve
No water flow
"Milky water"
POSSIBLE CAUSES
Electrical supply fault
Thermal cut out tripped
Thermostat setting too
low or faulty.
Excessive mains water
pressure
Expansion relief valve
fault
Loss of pressure from
Expansion vessel
Thermostat and
thermal cut out fault
Product incorrectly
Installed
Mains water supply
not turned on.
Blockage in main water
supply
Oxygenated water
ACTION
Check electrical supply
Check cut outs. If they have
operated then reset them.
If necessary replace them.
Check thermostats and if
necessary replace them.
Check thermostat setting.
Replace if necessary.
Check pressure from
Pressure reducing valve.
Replace if greater than
3.5 bar (51psi)
Replace expansion relief
valve.
Check and if necessary
re charge expansion vessel
pre charge pressure.
Replace thermostats and
thermal cut outs
Check inlet and outlet
connections are correct.
Check valves are installed
in accordance with flow
direction arrows.
Check mains water supply
is turned on.
Check mains water supply
for obstructions.
Check Expansion relief valve.
Water from a pressurised
system releases oxygen
bubbles when flowing. The
milkiness will disapear
after a short while.
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