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Mains supply off
YES
Open supply valve
Reduced Internal expansion
volume
YES
Repressurize expansion vessel.
Follow cold water discharge
instructions on page 4.
No water flow from hot taps
NO
Line strainer blocked
YES
Clear line strainer
If problem still persists contact a
competent engineer
Intermittent water discharge
NO
If problem still persists contact a
competent engineer
NO
Cold water PRV incorrectly fitted
YES
Check and refit as required
Thermal control failure
YES
Switch off power to immersion
heaters and boiler supply to the
unit. When discharge has stopped
check thermal controls and replace
as necessary
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