Fault Diagnosis - Mira Excel Installation & User Manual

1. Fault diagnosis

Read the section: Important Safety Information first.
Provided that the shower control has been correctly installed and is operated in
accordance with the instructions contained in this guide, difficulties should not arise.
If any maintenance is required then it must be carried out by a competent tradesperson
for whom the fault diagnosis chart and maintenance instructions are provided. Before
replacing any parts make sure that the underlying cause of the malfunction has been
identified.
Key
A. Instantaneous Gas Heated Showers
B. Unvented Mains Pressure and Thermal Store Systems
C. Gravity Systems/Pumped Systems
Malfunction
No flow/low flow
rate and/or
unstable fluctuating
temperature.
FAULT DIAGNOSIS
Cause
Spray plate assembly
blocked.
Incorrect spray plate
fitted.
Partially closed stop or
servicing valve in
supply pipe work to
shower control.
Instantaneous boiler
cycling on and off as
flow rate/pressure too
low.
Head of water below
minimum required.
Inlet strainer blocked.
Remedy
Clean the spray plate.
Refer to the shower
fitting maintenance
guide.
Fit high capacity spray
plate.
Open valve.
Fit high capacity spray
plate.
Increase flow/pressure
through system.
Contact boiler
manufacturer.
Raise cistern or fit Mira
pump.
Clean or renew.
Flush pipework before
refitting.
39
A B C