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13.0 FAULT FINDING - AQUATAP HEATER
SYMPTOM
No Indicator lights on
heater
Heater does not fill on
commissioning
Power light flashing
two pulses
Heater does not heat
up on commissioning
Power light flashing
three pulses
Heater does not fill
after commissioning
Power light flashing
two pulses
Heater does not heat
up after commisioning
Power light flashing
three pulses
Water flow from vent
and primary cut-out
operates
22
POSSIBLE CAUSE
1. If no water or heat - no power
to unit
2. if hot water available - no
power to indicators lights
1. If POWER on indicator is not
lit - no power to unit
2. Water supply not turned on
3. Solenoid valve fault
4. Low water pressure
5. Inlet pipe blocked
1. If POWER on indicator is not
lit - no power to unit
2. Element fault LED 3 on PCB
flashing
1. Level sensor fault
2. Solenoid valve fault
3. Electronic control PCB fault
4. Low water pressure
5. Inlet pipe blocked
1. Element fault - LED 3 on PCB
flashing
2. Electronic control PCB fault
3. Control thermistor fault -
short circuit - LED 4 on PCB
flashing
1. Solenoid valve fault
2. Level sensor fault
3. Electronics control PCB fault
4. Inlet pipe blocked
ACTION
1. Check power supply is correctly connected
and switched on. Check primary cut-out
has not operated
2. Check wiring harness to indicator lights is
plugged into control PCB
1. Check power supply is correctly connected
and switched on. Check primary cut-out
has not operated
2. Check water supply
3. Check solenoid operation, replace if
necessary
4. Check water is turned on and supply
pressure exceeds minimum requirements,
0.5 bar
5. Check inlet pipe filter is not obstructed
1. Check power supply is correctly connected
and switched on. Check primary cut-out
has not operated
2. Check heating element
1. Check level sensor earth connection
2. Check solenoid operation, replace if
necessary
3. Check all connections to the control PCB,
replace if necessary
4. Check water is turned on and supply
pressure exceeds minimum requirements
5. Check inlet pipe filter is not obstructed
1. Check element operation, if faulty replace
2. Check all connections to the control PCB,
replace if necessary
3. Check continuity
1. Check solenoid operations, replace if
necessary
2. Check level sensor earth connection
3. Check all connections to the control PCB,
replace if necessary
4. Check inlet pipe filter is not obstructed
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