10
10.0 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.
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.
ACTIONPOSSIBLE CAUSESFAULT
1. Check electrical supply1. Electrical supply faultWater not heating
WiringDiagram)
replace thermostat/thermal cut-out (see
check thermostat operation. If necessary
2. Check cut-out, if operated reset and2. Thermal cut-out tripped
necessary
3. Check thermostat operation, replace if3. Thermostat fault
POINTS)
U2 (s ee IMPORTANT INSTALLATION
Fit Pressure Reducing Valve Pack U1 and
pressure
Exc es s ive mains water
(continuously)
Pressure Relief Valve
Dis charge of water from
INSTALLATION POINTS)
1. Fit Pack U2 (see IMPORTANT
possible
1. Expansion in mains not
(intermittently)
Pres ure Relief Valv e
Dis charge of water from
2. Fit Packs U1 and U2
4.1 bar (60 p.s .i.)
2. Mains pressure exceeds
3. Fit Pack U2 when us ing Pack U1
Pack U2
3. Pack U1 fitted without
4. Replace Pres s ure Relief Valve4. Pressure Relief Valve Fault
(see Section 8.0)
Expansion Vessel pre-charge pressure
5. Check and, if necessary, re-charge
Expansion Vessel
5. Loss of pressure from
Replace thermostat and thermal cut-out
cut-out fault
Thermostat and thermal
Pressure Relief Valve
water/steam from
Relief Valve and or
Temperature/Pressure
Dis charge of water from
in accordance with flow direction arrows
1. Check all valves are correctly installed
fitted
1. Inlet valves incorrectly
o water flow
2. Check mains water supply is on
turned on
2. Mains water supply not
fitted check the strainer is not blocked
3. Check for obstructions. If Pack U1 is
supply
3. Blockage in mains water
while.
milkiness will disappear after a short
oxygen bubbles when flowing. The
Water from a pressurised system releasesOxygenated water "Milky" water
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