User guide

38
Installer Fault Diagnosis: refer to appliance diagram and customer fault
diagnosis
Read the section “Important Safety Information” first.
Providing the shower 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. To work on
gas heater appliances an installer MUST be CORGI registered. Before replacing any
parts ensure that the underlying cause of the malfunction has been resolved.
Key for applicability column
A - Instantaneous gas heated showers.
B - Unvented mains pressure showers.
C - Mains pressurised, instantaneous hot water, heated from thermal store showers.



























Shower
insufficiently hot.
Wide temperature
fluctuations from
shower when no
other draw-off is
being made.
(a) Maximum
temperature
incorrectly set.
Reset adjustable
maximum
temperature.
(b) Heater not set on
maximum hot.
(c) Flow rate still too
high.
Consult heater
instructions for further
instructions.
Fit 9 l/min flow regulator
between shower control
and hose.
Increase supply pipe
size to premises.
(d) See also
“Shower
insufficiently
hot”.
Remedy
Malfunction
Cause
ABC



Check and clean inlet
strainers.
(a) Insufficient flow
rate causing the
heater to cycle on
and off.
(b) Insufficient water
pressure causing
the heater to
cycle on and off.
(c) Heater not fully
modulating.
Refer to Installation
Requirements.