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12.0 FAULT FINDING
Disconnect the electrical supply before removing the terminal cover. It is recom-
mended 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
Presure Relief Valve
(intermittently)
Discharge of water from
Temperature/Pressure
Relief Valve and/or
water/steam from
Pressure Relief Valve
No water flow
"Milky" water
NOTE: Use only Heatrae Sadia approved spare parts. Replacement of any parts with
components not recommended by Heatrae Sadia will invalidate the guarantee and
may render the installation dangerous.
10
POSSIBLE CAUSES
1. Electrical supply fault
2. Thermal cut-out tripped
3. Thermostat fault
1. Excessive mains water
pressure
2. Pressure Relief Valve fault
Loss of pressure from
Expansion Vessel
Thermostat and thermal
cut-out fault
1. Inlet valves incorrectly
fitted
2. Mains water supply not
turned on
3. Blockage in mains water
supply
Oxygenated water
ACTION
1. Check electrical supply
2. Check cut-out, if operated reset and
check thermostat operation. If necessary
replace thermostat/thermal cut-out (see
WiringDiagram)
3. Check thermostat operation, replace if
necessary
1. Check pressure from Pressure Reducing
Valve. If greater than 3.5 bar (51 p.s.i.)
replace.
2. Replace Pressure Relief Valve
5. Check and, if necessary, re-charge
Expansion Vessel pre-charge pressure
(see Section 10)
Replace thermostat and thermal cut-out
1. Check all valves are correctly installed
in accordance with flow direction arrows
2. Check mains water supply is on
3. Check for obstructions. Check the
strainer in the Pressure Reducing Valve is
not blocked.
Water from a pressurised system releases
oxygen bubbles when flowing. The
milkiness will disappear after a short
while.
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