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7.0 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
pressure (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"
16
POSSIBLE CAUSES
1. Electrical supply fault
2. Thermal cut-out tripped
3. Thermostat fault
Excessive mains water
pressure
1. Expansion in mains not
possible
2. Mains pressure exceeds
0.41 Mpa (4.1 bar)
3. Pack U1 fitted without
Pack U2
4.Pressure Relief Valve Fault 4. Replace Pressure Relief Valve
5. 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 main 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 Wiring Diagram)
Check thermostat operation
Replace if necessary.
Fit Pressure Reducing Valve
Pack U1 and U2
(see IMPORTANT
INSTALLATION POINTS)
1. Fit Pack U2 (see IMPORTANT
INSTALLATION POINTS)
2. Fit Packs U1 and |U2
3. Fit Pack U2 when using Pack
U2
5. Check and, if necessary,
re-charge Expansion Vessel
pre-charge pressure
(see section 9.0)
Replace thermostats and
thermal cut outs
Check all valves are correctly
installed in accordance with
flow direction arrows
2. Check mains water supply
is on
Check for obstructions. If Pack
U1 is fitted check the strainer
is not blocked
Water from a pressurised
system releases oxygen
bubbles when flowing. The
milkiness will disapear
after a short while.
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