20
8.0 FAULT FINDING
WARNING: DISCONNECT FROM ALL ELECTRICAL SUPPLIES BEFORE
BEGINNING ANY WORK ON THE MULTIPOINT SS. FLUID CONTAINED
IN THE CYLINDER MAY BE VERY HOT!
The Multipoint SS should give trouble free operation, however should a
problem occur, the table below should enable most faults to be identified
with ease.
Fault Finding should be carried out by a competent person and any replacement
parts used should be authorised Heatrae Sadia Multipoint SS spare parts.
TABLE 04: Fault finding table
FAULT
POSSIBLE CAUSE
REMEDY
Water not heating
Electrical supply fault.
Thermal cut out tripped.
Check electrical supply. Check cut out. If
operated then reset. Check thermostat &
replace if necessary.
Thermostat setting to low
or faulty.
Check and adjust setting if required. Re-
place if necessary.
Discharge of water from pres-
sure relief valve
(continuously).
Excessive mains water
pressure.
Check pressure from pressure reducing
valve. Replace if greater than 3.5bar (51psi)
Expansion relief valve fault.
Replace expansion relief valve.
Discharge of water from pres-
sure relief valve
(intermittently).
Loss of pressure from
expansion vessel.
Check and if necessary recharge expan-
sion vessel precharge pressure.
Discharge of water from
temperature/pressure relief
valve and/or water/steam from
pressure relief valve
Thermostat and thermal cut
out fault.
Replace combined thermostat & thermal
cut out.
No water flow
Product incorrectly installed.
Check inlet & outlet connections are cor-
rect. Check valves are installed in accord-
ance with flow direction marks.
Mains water supply not
turned on.
Check mains water supply is turned on.
Blockage in mains water
supply.
Check mains water supply for obstructions.
Check expansion relief valve.
Check strainer in pressure reducing valve.
“Milky water”
Oxygenated water
Water from a pressurised system releases
oxygen bubbles when flowing. The milki
-
ness will disappear after a short while.