ISSUE 2016 Rev 1 - Installation Manual
3
RM Cylinders
FAULT FINDING
Symptoms
Possible Causes
Follow up action
Cylinder appears to leak from within
the case.
Loose cylinder connection.
Check all connection points including
immersion heaters to ensure integrity of joint and
remake any suspect joints.
Expansion Valve operates and water
is visible at the Tundish.
Possible fault at Pressure Reducing Valve.
Follow fault finding information for Inlet
Control Group.
Back pressure from the system.
Check all mixer type outlets are served by a
balanced cold service. Where not re-pipe or
install bespoke pressure reducing valve to
offending outlet.
Expansion Valve operates when
cylinder is heated.
Baffle requires adjustment.
Follow process to re-establish the bubble.
Noise when operating tap outlet.
Insecure Pipework.
Increase the number of pipe clips.
External works to public mains.
Wait for works to be completed.
Reduced water flow.
Debris from water mains.
Strip & clean or replace Inlet Control
Group.
Pressure Reducing Valve sticking.
Strip & clean or replace Inlet Control
Group.
No hot water available.
Immersion heater failure.
Follow fault finding information for
Immersion Heater
Boiler failure.
Check operation of the boiler and its
controls.
INLET CONTROL GROUP - FAULT FINDING
Is the Safety Relief
Valve passing?
Do you have
pressure?
Is the pressure
to specification?
Is the Pressure Reducing
Valve working correctly?
Inlet Control Group
YES
NO
NO
YES
YES
YES
YES
YES
Check outlet pressure
i.e. no greater than 3 bar.
Check the strainer
and service valve.
Re-establish air bubble.
Pressure Okay.
Replace the Safety
Relief Valve.
Valve serviced and
is okay to use.
PRV Failed.
No fault
with this Inlet Group.
Replace the Pressure
Relief Valve.
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