13
7.0 FAULT FINDING
Disconnect the electrical supply before removing the terminal cover. It is
recommended that any service operations on the heater are carried out by
a competent person.
FAULT POSSIBLE CAUSES ACTION
Water not heating 1. Electrical supply fault Check electrical supply
2. Thermal cut-out tripped Check cut-out, if operated,
reset and check thermostat
operation. If necessary replace
thermostat/thermal cut-out
(see Wiring Diagram Fig. 05, page 8)
3. Thermostat fault Check thermostat operation.
Replace if necessary.
Discharge of water from Excessive mains water Fit Expansion vessel, check valve
pressure relief valve pressure and pressure reducing valve.
Discharge of water from 1. Expansion in mains not Fit Expansion vessel and check
pressure relief valve possible. valve (see IMPORTANT
(intermittently). INSTALLATION POINTS SECTION 3)
2. Mains pressure exceeds Fit Expansion vessel, check valve
0.41 Mpa (4.1 bar) and pressure reducing valve.
3. Pressure Relief Valve Fault Replace Pressure Relief Valve
4. Loss of pressure from Check and, if necessary,
Expansion Vessel re-charge Expansion Vessel
Discharge of water from Thermostat and Replace thermostats and
Temperature/Pressure thermal cut out fault thermal cut outs
relief valve and/or
water/steam from
pressure relief valve
No water flow 1. Inlet valves incorrectly Check all valves are correctly
fitted installed in accordance with
2. Mains water supply not Check mains water supply
turned on is on
3. Blockage in main water Check for obstructions. If
supply pressure reducing valve with
strainer is fitted, check strainer is
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