Symptom
Cause
Remedy
No flow or low
flow rate and
/ or varying
temperatures.
Check showerhead, hose and
filters for any blockage.
Clean as necessary, refer to
Maintenance section (page
20).
Partially closed stop or service
valve
in
water
supply
pipework to the shower valve.
Open stop or service valve.
Instantaneous water heater
cycles on and off as the
flow rate or pressure is too
low.
Increase water flow rate or
pressure through system.
Contact the boiler manufacturer.
Head of water is below the
minimum distance required.
Raise the cistern or fit a shower
booster pump.
Inlet filter is partially blocked.
Clean or replace, flush through
pipework before refitting.
Hot or cold water being drawn
off elsewhere causing pressure
changes or instantaneous
boiler temperature changes.
Do not use other water outlets
when using the shower.
Make sure the maintained
inlet pressures are nominally
balanced and sufficient.
Refer to Specification (page 6).
Airlock or partial blockage of
the pipework.
Flush through pipework to ensure
removal of debris and anyairlocks.
No hot or cold water reaching
the shower valve.
Check hot and cold feeds (the
valve will shut down if either
the hot or cold supply fails).
Only hot or
cold water
from the
shower valve
outlet.
Partially closed stop or service
valve
in
water
supply
pipework to the shower valve.
Open stop or service valve.
Inlet filter is partially blocked.
Clean or replace, flush through
pipework before refitting.
Inlet water supplies are
reversed (hot to cold
supply).
Check the connections are the
correct way round. Hot on the
left and cold on the right
when viewed from the front.
Rework pipework as
necessary.
Troubleshooting
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