WarmFlow DI110UV - Fault Finding

Page 31 of 34
8.4 Fault Finding
Symptom
Possible cause
Possible remedy
Little / no hot water flow
Mains water supply isolated
Open stopcock.
Strainer blocked
Turn water supply off, remove strainer and clean.
Pressure reducing valve fitted the wrong way
Refit with arrow pointing in direction of flow
(refer to Figure 6).
Water from hot taps is cold
Boiler programmer or immersion timer not
calling for hot water
Set programmer / timer to call.
Cylinder thermostat high limit tripped or
immersion thermostat high limit tripped
Check and reset (refer to Section 1).
Heat source malfunction
(e.g. boiler / immersion heater / etc)
Check heat source – if faulty, refer to heat source manufacturer’s
instructions.
Motorised valve malfunction
(where fitted, n/a to Direct models)
Manually activate motorised valve.
If cylinder begins to heat, replace valve.
Pump malfunction
(n/a to Direct models)
Check wiring and/or plumbing connections to pump.
Plate Heat Exchanger Blocked
Descale / Replace the Plate Heat Exchanger
Water from hot taps extremely
hot
Controls malfunction
Isolate all heat sources, call installer
Intermittent water discharge
from tundish
Expansion vessel has lost its pre-charge
Turn off water supply, open hot tap, check bladder pre-charge and
recharge to 3 bar.
Inlet group balanced cold / cylinder connections
reversed
Check and reconnect (refer to Figure 6).
Continuous water discharge
from tundish
Pressure reducing valve not working
Check pressure from pressure reducing valve – if greater than 3 bar,
replace cartridge.
Expansion relief valve not seating correctly
Manually operate the valve for 30 seconds to clear any debris from the
seat / replace valve.
Temperature & pressure relief valve not seating
correctly
Manually operate the valve for 30 seconds to clear any debris from the
seat / replace valve.
System control / safety feature failure
IMMEDIATELY switch off all power supplies. Contact your installer.