Fault Diagnosis - Mira Zest 7.5 Installation, Operation And Maintenance Manual

Fault Diagnosis

WARNING! There are no user serviceable components beneath the cover of the
appliance. Only a competent tradesperson should remove the cover.
The trouble shooting information tabled below gives details on what you can do as a user
without removing the cover should you encounter difficulties whilst operating the shower.
Note! Should these remedies prove to be unsuccessful in solving your problem, contact
your installer for advice.
Malfunction
No water or very low
flow rate.
Appliance fails to
produce hot water in
any switch position.
Shower cycles from
hot to cold.
26
Fault Diagnosis
Cause
Handset sprayplate
blocked.
Incoming water supply
stop valves or appliance
isolating valve turned
down or off.
Hose or Handset blocked
Electrical supply isolated
at double pole switch (the
pullcord).
Fuse blown or MCB/RCD
tripped indicating
possible electrical fault.
The temperature knob is
positioned at an unsafe
level causing the
appliance thermal trip to
operate and cut the
power to the heater tank.
Remedy
Remove & clean (Refer to
Maintenance in the I,O& M
guide for the fittings).
Turn stop/isolating valve to
the fully on position.
Clear blockage or renew
Switch on electrical supply via
the double pole switch.
Renew the fuse or reset the
MCB/RCD. If fault persists,
contact your installer.
Turn the temperature knob
sufficiently anti clock-wise to
increase water flow and
reduce temperature.
(Continued)