Fault Finding - Heatrae Sadia B3M Fitting Instructions And User Manual

7.0 FAULT FINDING

WARNING: DISCONNECT FROM ALL ELECTRICAL SUPPLIES BEFORE
BEGINNING ANY WORK ON THE B3M OR C3M WATER HEATER. FLUID
CONTAINED IN THE WATER HEATER MAY BE VERY HOT!
The B3M & C3M unist should give trouble free operation, however should a
problem occour, the tables below should enable most faults to be identified
with ease.
Fault Finding should be carried out by a competent person and any replacement
parts used should be authorised Heatrae Sadia spare parts.
FAULT
Water not heating Electrical supply fault. Check electrical supply.
No water flow -
General
No water flow
- Open Outlet
installations
No water flow
- Cistern Fed
installations
Water flows
gradually reduces
- Cistern Fed
installations
POSSIBLE CAUSES
Thermal cut-out
tripped.
Thermostat fault.
Element fault.
Cold water supply not
turned on.
Blockage in cold
watter supply.
Open outlet tapset
not correctly installed.
Blockage in tapset.
Blockage in tapset.
Cistern tank empty.
Cistern not filling as
fast as outlet flow
rate.
Vent pipe blockage.
ACTION
Check cut-out, if operated reset
and check thermostat operation.
If necessary replace.
Check thermostat operation,
replace if necessary.
Check element for circuit
continuity and insulation
resistance. If faulty replace.
Check mains water supply is on.
Check for obstructions.
Check water connections to
tapset.
Check for obstructions.
Check for obstructions.
Check water supply to cistern
tank is turned on. Check
operation of cistern float valve.
Check water supply to cistern
tank is turned on and that the
inlet flow rate is equal to outlet
flow rate. Check operation of
cistern float valve.
check vent pipe for obstructions,
clear as necessary.
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