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| Display /Fault | Description | Possible Solution |
|---|---|---|
| No Display | Switch turned off / No water flow | Turn off the water supply, and check the switch is pushed in (the ON position). Ensure the water flow through the heater exceeds the minimum water flow required |
| Low Temperature | Temperature Selector position | Check that the gas selection knob is set to maximum (fully clockwise), and that the water flow selector is in the correct position. If the temperature shown on the ICU display and the delivered temperature are not the same, check the resistance of the temperature thermistor on the right-hand side of the heat exchanger. Also check for possible cross connections |
| E9 | Temperature Limiter Tripped | Disconnect the wires from the temperature thermistor (over temperature sensor) on the right-hand side of the heat exchanger, and test the resistance of the thermistor. If the resistance is greater than 0.1 ohm, replace the thermistor. |
| EA | Safety Time Out | Failure to ignite will cause Safety Time Out. Three possible causes are: 1. Ignition failure due to insufficient gas supply. Check the gas supply to the unit, Correct if necessary. 2. Flame rod not detecting pilot flame. Check the wiring connection to the ICU. Measure the flame rod current (should be 10 - 12 µA DC). Check the condition of the pilot flame, and if dirty, clean or replace the injector. If the pilot is clean, and the voltage from the flame rod is correct, replace the ICU. 3. If the pilot is failing to light, measure the voltage to the orange pilot solenoid (should be 0.9 - 1.2 Volt DC). If the voltage is correct, replace the solenoid. If the voltage is incorrect, replace the ICU. (note:- always check the voltage with the wiring connected) |
| F7 | False Flame Indication | This fault can result from an earthing problem with the flame sensor rod, or an ignition pack failure. Clean the flame rod and ensure the wires are adequately connected. If the fault remains, replace both the flame sensor rod and the ICU. |
| F0 | Power activated while water flowing | This fault indicates the power switch has been activated while water was flowing. Rectify by closing all hot water outlets so that no water is flowing. Press the switch (the ON position), then open the hot water outlet. |
| E0 | Ignition Error | Similar to fault code EA. . Three possible causes are: 1. Ignition failure due to insufficient gas supply. Check the gas supply to the unit, Correct if necessary. 2. Flame rod not detecting pilot flame. Check the wiring connection to the ICU. Measure the flame rod current (should be 10 - 12 µA DC). Check the condition of the pilot flame, and if dirty, clean or replace the injector. If the pilot is clean, and the voltage from the flame rod is correct, replace the ICU. 3. If the pilot is failing to light, measure the voltage to the orange pilot solenoid (should be 0.9 - 1.2 Volt DC). If the voltage is correct, replace the solenoid. If the voltage is incorrect, replace the ICU. (note:- always check the voltage with the wiring connected) |
| A7 | Water Temperature Thermistor Error (No lock out) | This fault results from the temperature thermistor on the right-hand side of the heat exchanger failing to give a temperature indication. This fault will not stop the heater operating, but will first display '00' on the ICU display before changing to 'A7' on the ICU display. Ensure wiring connections to the thermistor. If this does not rectify the fault, test thermistor readings in ohms in conjunction with thermistor chart to assess correct readings |
| A4 | Flue Safety Device Tripped | The Flue Safety Device (FSD) has activated indicating the heater is incorrectly flued causing spillage of flue gases into the room, or, the FSD is defective. Disconnect the wiring from the FSD, and measure the resistance. If the resistance is greater than 0.1 ohm, replace the FSD. If the resistance is less than 0.1 ohm, check the flueing on the appliance to ensure it is all on the vertical plane. Pay special attention to the flue cowl which should be an approved model. |
| E1 | Over Temperature Condition (No lock out) | An indication the a water temperature in excess of 85°C has been detected. This will not cause the appliance to cease operation, however, service attention is required. Verify gas pressure to confirm pressure is not excessive. Also confirm that water flow rate did not become insufficient such that the 85°C setting was exceeded. |
| Red LED Flashing | Low water flow | Indicates low water flow through the appliance. Check the water inlet filter is not blocked, and that the water supply to the water heater is adequate. |
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Temperature °C
|
10
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20
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30
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40
|
50
|
60
|
70
|
80
|
90
|
100
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Resistance K ohms
|
22.75
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14.74
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9.78
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6.64
|
4.60
|
3.25
|
2.33
|
1.70
|
1.26
|
0.95
|
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