Electrolux Nano Pro Manuel utilisateur

SERVICE MANUAL

PILOTLESS ELECTRONIC WATER HEATERS

1.- NO IGNITION No spark present. ...................................................................... 2

2.- NO IGNITION Water Heater sparking but the burner does not ignite. ............................ 3

3.- THE WATER FLOW IS VERY LOW ...................................................................... 3

4. CONTINUOUS SPARKING WHEN WATER HEATER IS IGNITED ...................................... 4

5.- SPARKING, BURNER IGNITES FOR A FEW SECONDS AND THEN SWITCHES OFF............... 4

6.- HARD IGNITION OF THE WATER HEATER THERE IS NO SOFT START.......................... 5

7.- WATER HEATER CONTINUES SPARKING WHEN TAP IS TURNED OFF............................. 5

8.- WATER HEATER SWITCHES OFF AFTER FEW MINUTES OF OPERATION ........................ 6

9.- WATER HEATER REMAINS IGNITED WHEN TAP IS CLOSED ...................................... 7

10.- FLAMES IN BURNER ARE YELLOW ..................................................................... 7

11.- THE BATTERY LIFE IS VERY SHORT .................................................................. 8

12.- USEFUL DATA............................................................................................. 9

13.- IGNITION SEQUENCE ..................................................................................10

14.- PHOTO GALLERY .........................................................................................11

2 of 15

1.- NO IGNITION No spark present.

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

No Spark

Check there is a battery in the Battery Box Insert a full battery in the Battery Box. Photo 1

Check that the battery is placed in the Battery Box in the correct

position Correct the position of the Battery. Photo 1.

The switch in the electronic circuit is in off position. Turn the switch on (inner position). Photo 4

The micro switch is not correctly connected or the connectors are

loosened. Check the status of the micro switch connection. Photo 7

Low water pressure. The main gas valve is not opening.

Check the water pressure.

Change the position of the temperature selector to Max.

temperature. ( Min Water Flow) Photo 4

The water inlet filter is dirty. The Water Flow is very low. Clean the water filter. Photo 3

The micro switch is not working correctly.

Disconnect the micro switch from the circuit. Shut off the gas inlet.

Short circuit the terminals in the electronic circuit. The circuit must

generate spark if circuit is O.K.

Adjust / Change the micro switch. In case it is necessary.

High ambient humidity. No sparking between electrodes. Dry the electrodes and clean them. Photo 5

The spark electrode wires have lost their insulation. Sparking is

taking place between the wires and earth or between the two

wires.

The electrode connector is defective.

Replace the electrode unit. Photo 5

The Ground connection of the electronic circuit is not correctly

connected. --> The Servo hasn’t any Voltage. Tighten the ground connection terminal. Photo 6

Wires not well connected to electronic circuit. Check the wiring installation.

TTB switch in Draught diverter is tripped Check that TTB is not Tripped (Tripped means contact opened).

Water valve diaphragm broken.

Communication channel between chambers obstructed.

Disassemble Water Valve. Change the diaphragm.

Clean the communication channel. Photo 8.

All models

Venturi obstructed. Check and change venturi. Photo 9.

3 of 15

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

No Spark

Water valve O-rings are blocked. Disassemble Water Valve. Work the water pin manually to unblock

them / Change the top cover of the water valve. Photo 10.

All models

Main gas valve seal is blocked. Work the gas pin manually to unblock the O-ring. Photo 11.

Change Gas valve.

2.- NO IGNITION Water Heater sparking but the burner does not ignite.

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Battery Voltage very low. Sparkling is very at low frequency and

sounds very weak. Replace Battery. Use Alkaline battery. Photo 1

Battery is not correctly inserted in the Battery box. Check position of the Battery. Photo 1

No gas.

Low gas pressure. Open gas valve. / Check gas pressure.

Main Gas Valve is not opened. Microswitch needs adjustment Adjust Microswitch. Must be activated only with main valve opened

The spark is not generated in the sparking electrode. Check humidity on electrodes. Photo 5.

Check position of electrodes or whether they are deformed.

There is no voltage in Servo valve terminal.

Check the Electronic circuit earth connection. Photo 6.

Check the wiring.

Change the Electronic circuit.

It sparks but

the burner does

not ignite

In case there is voltage in servo terminal. Change the gas valve. The servo is incorporated in the gas valve.

3.- THE WATER FLOW IS VERY LOW

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Water pressure is too low. Change the position of the water selector to MAX.. Photo 4

The water filter is dirty. Clean the water filter. Change the water filter. Photo 3.

The water flow is

very SMALL and the

water is coming out

VERY HOT. The heat exchanger in combustion chamber is obstructed. Clean the heat exchanger.

Change the combustion chamber.

4 of 15

4. CONTINUOUS SPARKING WHEN WATER HEATER IS IGNITED

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Continuous sparking

and burner is ignited

The electronic circuit is not working correctly. Replace the Electronic circuit. Photo 2.

5.- SPARKING, BURNER IGNITES FOR A FEW SECONDS AND THEN SWITCHES OFF

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Air in gas pipes. Purge air from gas pipes.

Low gas pressure. Check gas pressure.

The electrode unit has come loose.

The electrode flame sensor is out of position.

The electrode flame sensor is deformed. See manual:

electrodes life….

The electrode connector is not properly connected.

Tighten the electrode fixing screw. Photo 5.

Change the electrodes.

Check the connection of this connector. Photo 7 & Photo 13.

The electronic circuit Ground terminal is not properly

connected. Tighten the Ground connection terminal. Photo 6.

Electronic circuit is defective. No Voltage in Servo terminal Change the electronic circuit.

The burner switches

off after remaining

on for a few

seconds

Servo Valve is defective Check Voltage in Servo terminal. Photo 17.

5 of 15

6.- HARD IGNITION OF THE WATER HEATER THERE IS NO SOFT START

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Battery Voltage very low. Sparkling is very at low

frequency and sounds very weak. Replace Battery. Use Alkaline battery. Photo 1.

The electrodes are not correctly fixed to the manifold.

They are too high referred to the burner blades. Fix the electrodes correctly using the fixing screw. Photo 5.

There is a gas accumulation in the combustion chamber Electronic circuit defective, there is servo voltage with no Flame.

Check Servo valve closes when no energized.

There is air in the gas supply line. Drain the gas circuit.

Excessive gas pressure. Check the gas inlet pressure Photo 17. Nominal gas Pressure 13 mbar.

Check / adjust the gas pressure in the burner Photo 12.

The Ground terminal of the electronic circuit is not

properly connected. Tighten the Ground connection terminal. Photo 6.

Defective wiring of electronic circuit. Check the wiring and change it if necessary.

The servo is not working correctly. No soft start function Change the gas valve. The Servo is integrated in the gas valve. Photo 17.

The burner ignites

WITHOUT SOFT

START

The nozzles are not well fitted. The change of gas type has not been made correctly.

7.- WATER HEATER CONTINUES SPARKING WHEN TAP IS TURNED OFF

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Micro switch not properly adjusted. Check micro switch adjustment. Microswitch adjustment screw Photo 17.

The micro switch has broken (The contacts are stuck).

Sparkling only occurs for 5 seconds. Check function of micro switch Change the micro switch Photo 17 –

The water heater is

sparking when the

tap is turned off.

The Electronic circuit is faulty. Change the Electronic circuit Photo 2.

6 of 15

8.- WATER HEATER SWITCHES OFF AFTER FEW MINUTES OF OPERATION

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Low Battery Voltage Replace the Battery. Photo1.

Gas pressure/flow insufficient. Check burner gas pressure. Photo 18.

Drop in water pressure during functioning of the water

heater. Check the water pressure.

The TTB sensor is Tripped. Smoke exhaust defective Check the status of the TTB sensor. Photo 16.

The water filter is dirty. Check the status of the water filter. Change or clean it if necessary.

Photo 3.

Membrane in water valve broken. Change the membrane. Photo 8.

Venturi dirty / obstructed. Remove and check the venturi. Change it if necessary. Photo 9.

The electrode unit has become loose. Tighten the electrode fixing screw. Photo 5.

The electrode connector is not properly connected. Check the connection of this connector. Photo 2 and 13.

The Ground terminal of the electronic circuit is not

correctly connected. Tighten the Ground connection terminal. Photo 6.

Electronic circuit is defective. Change the control circuit.

Water heater

switches off after

few minutes of

operation

The Servo is defective. Test Voltage in Servo. Change the gas valve in case there is no

function. The servo is integrated in the gas valve. Photo 17 and 18

7 of 15

9.- WATER HEATER REMAINS IGNITED WHEN TAP IS CLOSED

This is a DANGEROUS situation because the Pressure and Temperature in the combustion chamber will increase very fast,

DISCONNECT THE GAS SUPPLY TO THE WATER HEATER.

PERMANENT DAMAGES AND DEFORMATIONS IN WATER VALVE AND COPPER PIPES.

SYMPTOM POSSIBLE CAUSE OF FAILURE

SOLUTION

Water Valve shaft blocked. Check the water valve/change the top cover of the water valve. Photo

10.

Communication channel between chambers obstructed. Clean the communication channel. Photo 8

Water leak from upper cover – rust in water neck

blocking up the pins. Change the water and gas valves.

Main regulator of open selector in water valve is

blocked..

Check the regulator move freely in their housing. Photo 9

Change the Water Valve if necessary

Venturi obstructed. Check / change venturi. Photo 9

The water heater

remains ignited

when the tap is

turned off.

Gas shaft blocked. Check the gas pin O-ring / change the O-ring Photo 11.

10.- FLAMES IN BURNER ARE YELLOW

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Excessive gas pressure. Check gas pressure at the water heater inlet and at the burner.

Adjust Burner Pressure. Photo 12, 17 and 18.

Dirt in burner. Clean the burner.

Unsuitable nozzles.

The gas change has not been made correctly. Replace the nozzles.

Burner flames are

yellow

Burner incorrectly assembled or misaligned. Adjust burner or align it.

8 of 15

11.- THE BATTERY LIFE IS VERY SHORT

SYMPTOM POSSIBLE CAUSE OF FAILURE SOLUTION

Some of the wirings is damaged and is in contact with

a metallic part of the water Heater

Review status of wirings.

Change electrical installation if necessary

The servo valve current consumption is very high Servo valve defective. Change gas valve.

The servo valve is always opened. Electronic circuit defective / Replace Electronic circuit. Photo 2

Electronic circuit defective. Replace electronic circuit. Photo 2.

The Battery life is

very short

A Saline Battery has been used. Battery must be Alkaline.

9 of 15

12.- USEFUL DATA

CONNECTION DIMENSIONS

GAS 3/4"

WATER INLET 3/8"

WATER OUTLET 1/2"

EXHAUST

Chimney Diameter 112 mm internal

DIMENSIONS

ABCDEFGHI J K L

310 578 228 240 112 102 69,4 21 50 133,8 210 115,6

GAS INLET PRESSURE

NATURAL G20 13mbar

BURNER PRESSURE

10,8 mbar

WATER PRESURE

Maximum 13 bar

Minimum OS 0,25 bar

Minimum CS 0,15 bar

10 of 15

13.- IGNITION SEQUENCE

Open

the

Tap

Water Valve

Pin goes Up

Main Gas Valve

Opens

GAS TO

BURNER

Microswitch

contacts

BURNER

IGNITED

Servo valve

OPENS

Spark in

Electrodes.

Control

circuit

Water Heater

Working System

Tripped

Main Gas Valve closed

Microswitch opens

Servo valve Closed

YES NO

5 seg.

timer

Flame

detection

t< 5seg

Flame LED

YES

Is the Tap

opened?

Water Heater in

Stand by. To Reset the system;

Close and re open the

Tap

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