15
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
POSSIBLE CAUSES
ACTION
Water not heating Electrical supply fault. Check electrical supply.
Thermal cut-out
tripped.
Check cut-out, if operated reset
and check thermostat operation.
If necessary replace.
Thermostat fault.
Check thermostat operation,
replace if necessary.
Element fault.
Check element for circuit
continuity and insulation
resistance. If faulty replace.
No water flow -
General
Cold water supply not
turned on.
Check mains water supply is on.
Blockage in cold
watter supply.
Check for obstructions.
No water flow
- Open Outlet
installations
Open outlet tapset
not correctly installed.
Check water connections to
tapset.
Blockage in tapset.
Check for obstructions.
No water flow
- Cistern Fed
installations
Blockage in tapset.
Check for obstructions.
Cistern tank empty.
Check water supply to cistern
tank is turned on. Check
operation of cistern float valve.
Water flows
gradually reduces
- Cistern Fed
installations
Cistern not filling as
fast as outlet flow
rate.
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.
Vent pipe blockage.
check vent pipe for obstructions,
clear as necessary.
