Mira Excel Installation & User Manual page 41

Malfunction
Shower
temperature too
cold (maximum
temperature
correctly set).
Leak from shower
control body.
Flow control lever
stiff to operate.
Cause
Hot water temperature
less than 12 °C above
the required shower
blend temperature.
Instantaneous boiler
not igniting because
the water flow rate is
too low.
Instantaneous boiler
not igniting because
the water pressure is
too low.
Cartridge inlet or outlet
seals missing or
damaged.
Pressure build up
causing damage to the
cartridge. This may be
due to domestic hot
water expansion.
Pressure build up. This
may be due to
domestic hot water
expansion.
Remedy
Adjust the hot water
temperature or wait for
the water to reheat if
stored system.
Fit high capacity spray
plate.
Increase flow rate
through the system.
Check the cartridge
inlet filters, clean or
replace.
Contact boiler
manufacturer.
Increase water
pressure.
Contact boiler
manufacturer.
Fit new seals.
Fit domestic hot water
expansion vessel. If
one already fitted, it
may be deflated and
require
repressurization.
If necessary, fit new
cartridge.
Fit domestic hot water
expansion vessel. If
one already fitted, it
may be deflated and
require
repressurization.
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