Fault Finding - Heatrae Sadia B3 M Installation And User Instructions Manual

10.0 FAULT FINDING

Disconnect the electrical supply before removing the terminal cover. It is recom-
mended that any service operations on the B3M or C3M heaters are carried out by a
competent person.
FAULT
Water not heating
No water flow - General
No water flow - Open
Outlet installations
No water flow - Cistern
Fed installations
Water flow gradually
reduces - Cistern Fed
installations
NOTE: Use only Heatrae Sadia approved spare parts. Replacement of any parts with
components not recommended by Heatrae Sadia will invalidate the guarantee and
may render the installation dangerous.
10
POSSIBLE CAUSES
1. Electrical supply fault
2. Thermal cut-out tripped
3. Thermostat fault
4. Element fault
1. Cold water supply not
turned on
2. Blockage in cold water
supply
1. Open Outlet tapset not
correctly installed
2. Blockage in tapset
1. Blockage in tapset
2. Cistern tank empty
1. Cistern not filling as fast
as outlet flow rate
2. Vent pipe blockage
ACTION
1. Check electrical supply
2. Check cut-out, if
operated reset and check
thermostat operation. If
necessary replace
h / h
3. Check thermostat
operation, replace if
necessary
4. Check element for circuit
continuity and insulation
resistance. If faulty
replace.
1. Check mains water
supply is on.
2. Check for obstructions.
1. Check water
connections to tapset
2. Check for obstructions.
1. Check for obstructions.
2. Check water supply to
cistern tank is turned on.
Check operation of cistern
float valve.
1. Check water supply to
cistern tank is turned on
and that inlet flow rate is
equal to outlet flow rate.
Check operation of cistern
float valve.
2. Check vent pipe for
obstructions, clear as
necessary.
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