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Fault nding
The Fault Finding chart will enable operational faults to be identied and their possible causes
rectied. Any work carried out on the Remeha Flexistor unvented water heater and its associated
controls MUST be carried out by a competent installer for unvented water heating systems. In
case of doubt contact the Remeha Flexistor Service Department.
Fault Possible Cause Remedy
No hot water ow
Mains water supply o󰀨 Check and open stop cock/isolating valve
Strainer blocked Turn o󰀨 water supply, remove strainer and clean
Cold water combination valve incorrectly
tted
Check and ret as required
Water from hot tap
is cold
Auxiliary immersion heater not switched
on
Check and switch on
Auxiliary immersion heater thermal cut-
out has operated
Check, reset by pushing button on thermal cut-
out
External heat source not switched on Check, turn on external heat source
External heat source not working Check heat source operation. If fault is suspected
consult heat source manufacturer’s instructions
External heat source thermal cut-out has
operated
Check, reset by pushing button on thermal cut-
out
Check operation of heat source thermostat
Water discharges
from overow visual
indicator (tundish)
INTERMITTENTLY Incorrect pre-charge pressure for expansion
vessel
CONTINUALLY Check pressure from pressure reducing valve
Remove expansion relief cartridge from pressure
relief valve and check seating. If necessary t
new cartridge
Water discharges
from the T&P relief
valve intermittently
Expansion relief valve faulty Check valve and replace if necessary
Water discharges
from the T&P relief
valve continually
Thermal control failure
NOTE: Water will be very hot
Switch o󰀨 power to immersion heater(s) and
shut down external heat source. DO NOT turn
o󰀨 water supply. When discharge stops check all
thermal controls, replace if faulty
Performance has
deteriorated
GRADUALLY Check for scale build up in the DHW heat ex-
changer
Table 11 - Fault nding guide.
Servicing
Important
i) Servicing should only be carried by an authorised Engineer, Agents or by installers competent in
the installation and maintenance of unvented water heating systems.
ii) Any spare parts used MUST be authorised Remeha Flexistor parts.
iii) Disconnect the electrical supply before removing any electrical equipment covers.
iv) NEVER bypass any thermal controls or operate system without the necessary safety valves.
v) Water contained in the Remeha Flexistor unit may be very hot, especially following a thermal
control failure. Caution must be taken when drawing water from the unit.
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