Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual page 34

BOOST (UPPER)
IMM. HEATER NOT
OPERATING
BOOST (UPPER)
NOTE:
DO NOT CHECK ELEMENT
RESISTANCE WITH POWER
ON
TEMPERATURE
Diagram 32 Water Heater Fault Finding Boost (upper)
Immersion Heater Faults
WATER FLOW
WATER FLOW
WHEN OUTLETS
PROBLEMS
ARE OPENED
WATER FLOWING
WATER HOT
Diagram 33 Water Heater Fault Finding Water Flow
Faults
34 Installation & Servicing Instructions
IS 240V
CHECK 24 HOUR
SUPPLY AT NO
ELECTRICAL SUPPLY
24 HOUR
IS ON
TERMINALS
YES
IS 240V
SUPPLY AT
NO
PRESS BOOST
SWITCH
THERMOSTAT
TERMINALS
YES
REPLACE
NO
IMMERSION
HEATER
YES
IS
YES
THERMOSTAT
SET THERMOSTAT
SET TO A LOW
TO POSITION 4 TO 5
NO
HAS
YES
THE THERMAL
RE-SET THERMAL
CUT-OUT
CUT-OUT
OPERATED
NO
NO
REPLACE
THERMOSTAT
YES
ALLOW TIME FOR
WATER TO RE-HEAT
DOES
CHECK MAINS WATER
NO
SUPPLY IS ON.
CHECK COLD WATER
COMBI VALVE IS
CORRECTLY FITTED.
CHECK STRAINER IS
NOT BLOCKED
YES
IS CHECK OPERATION
NO
OF IMMERSION
HOT HEATERS
YES
CHECK AFTER A FULL
YES
OFF PEAK HEATING
PERIOD
NO
IS
NO
CHECK THERMOSTAT
SETTINGS
ENOUGH
CHECK INTERNAL
WIRING
NO
IS 240V
SUPPLY AT
BOOST (UPPER)
THERMOSTAT
TERMINALS
YES
DISCHARGE
EXPANSION RELIEF
INTERMITTENT
VALVE DISCHARGES
DISCHARGE
CONTINUOUS
Diagram 34 Water Heater Fault Finding Expansion
Valve Faults
TEMPERATURE / DISCHARGE
TEMPERATURE VERY
PRESSURE RELIEF
HOT ( >85 C )
VALVE DISCHARGES
DISCHARGE
AT NORMAL
OPERATING TEMP
(UP TO 70 C)
Diagram 35 Water Heater Fault Finding Temperature
& Pressure Relief Valve Faults
IS
CHECK DHW
YES
EXPANSION
VESSEL CHARGE
PRESSURE IS 3.5 BAR
NO
IS
CHECK COLD WATER
YES
COMBI VALVE
PRESSURE REDUCER
CONTROLS AT 3.5 BAR.
CHECK EXPANSION
VALVE OPERATION.
IS
THERMAL CONTROL
YES
FAILURE. CHECK
o THERMOSTAT
OPERATION
NO
IS
TEMPERATURE /
YES
PRESSURE RELIEF
VALVE FAULT.
o
REPLACE.