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1. Repressurize expansion vessel.
Follow recommissioning
instructions on page 4.
2. Switch off power to immersion
heater(s) and boiler supply to
the unit. When discharge has
stopped, check thermal
controls, replace it faulty.
Contact a competent person.
1. Heat pump not activated.
2. Immersion heater not switched
on.
3. Immersion heater thermal cut-
out has operated.
4. Programmer set to central
heating or not switched on.
5. Cylinder thermal cut-out has
operated.
6. Motorised valve not operating
correctly.
1. Check Heat Pump operation. If fault
suspected consult installer or heat
pump manufacturer.
2. Check and switch on.
3. Check and reset button (see
thermostat diagram page 9 and
safety cut-out on page 4 of
installation manual).
4. Check and set to hot water.
5. As at No. 2.
6. Check wiring and/or plumbing
connections to motorised valve.
(See page 8 of the installation
manual).
1. Reduced expansion vessel charge.
