Avanta Plus Heat Only Boilers 12v | 15v | 18v | 24v | 30v

Can be changed by users

Factory settings

P 1

Tset flow

20 – 85°C

75°C

75°C

75°C

P 2

Tset DHW

40 – 65°C

55°C

55°C

55°C

P 3

Boiler regulation

0 = CHoff and DHWoff 
1 = CHon and DHWon 
2 = CHon and DHWoff 
3 = CHoff and DHWon

2

2

2

P 4

Eco-mode or DHW preheat setting

0 = DHW preheat on
1 = DHW preheat off *
2 = regulated by controller

2

2

2

P 5

Anticipated current

0 = no anticipated current for thermostat on/off
1 = anticipated current for thermostat on/off

0

0

0

P 6

Display off automatically

0 = display stays off
1 = display stays on
2 = display light switches off automatically after 3 minutes

2

2

2

2

2

To be changed by installer only

Factory settings

P 17

Maximum fan speed CH (natural gas)

Do not change ***

24¹⁾

30¹⁾

35¹⁾

45¹⁾

52¹⁾

Maximum fan speed CH (propane)

Adjustments for propane firing

24¹⁾

28¹⁾

33¹⁾

43¹⁾

50¹⁾

P 18

Maximum fan speed DHW (natural gas)

Do not change ***

24¹⁾

30¹⁾

35¹⁾

45¹⁾

52¹⁾

Maximum fan speed DHW (propane)

Adjustments for propane firing

24¹⁾

28¹⁾

33¹⁾

43¹⁾

50¹⁾

P 19

Minimum fan speed
(CH and DHW) (natural gas)

Do not change ***

13

13

13

13

13

Minimum fan speed
(CH and DHW) (propane)

Adjustments for propane firing

20¹⁾

20¹⁾

20¹⁾

20¹⁾

20¹⁾

P 20

Starting fan speed

Do not change

25

25

25

25

25

P 21

Pump setting CH

Do not change

0

0

0

0

0

P 22

Pump running time after CH

1 – 99 minutes

2

2

2

2

2

P 23

Connection with Heat Recovery Unit (HRU)

0 = no connection with HRU
1 = connection with HRU

0

0

0

0

0

P 24

State remote alarm
(X7 terminal)

0 = off (connectors 1 and 2 closed)
1 =  alarm signal (connectors 1 and
2 closed)
2 = run indication (connectors 1 and
3 closed)
3 = ext. gas valve (connectors 1 and
3 closed)
4 = external pump relay (connectors
1 and 3 closed)

0

0

0

0

0

P 25

Legionella protection

0 = off
1 = on
2 = automatic (after putting boiler into operation, it will run for DHW operation 65°C once a week)

0

0

0

0

0

P 26

DHW cut-in temperature

2 – 15 °C

5⁵⁾

5⁵⁾

5⁵⁾

5⁵⁾

5⁵⁾

P 27

Heat curve set point flow temperature

0 – 60 °C

20

20

20

20

20

P 28

Heat curve set point outside temperature (min)

0 – 30 °C

20

20

20

20

20

P 29

Heat curve set point outside temperature (max)

-40 – 0 °C

-15⁴⁾

-15⁴⁾

-15⁴⁾

-15⁴⁾

-15⁴⁾

P 30

Boiler type

Do not change

3

3

3

3

3

P 31

DHW control stop

0 – 20 °C

15⁵⁾

15⁵⁾

15⁵⁾

15⁵⁾

15⁵⁾

PdF (PdU is shown later)

Restore factory settings

On identification plate dF setting X is shown. Change parameter into X will restore the factory settings.

X

X

X

X

X

On identification plate dU setting Y is shown. Change parameter into Y will restore the factory settings.

Y

Y

Y

Y

Y

E0

Flow or return sensor fault

Short circuit in the flow, return or boiler temperature sensor

Check the wiring and the connections of the sensors visually: are the plugs all correctly in position? With a multimeter: measure the resistance in the wiring and connection.

Defective or not (properly) connected flow, return or boiler temperature sensor

Check that the sensors are working; take the sensors out * and measure the resistance with a multimeter at room temperature (20 – 25°C); the sensor is working properly if the resistance is between 12 and 15 kΩ.

E1

Flow temperature is higher than the set maximum temperature

Insufficient water

Check the minimum water pressure, read off the gauge.

No through flow

Check that the pump is working; turn the spindle with a screwdriver, if that works but the pump still does not respond, check the wiring; if that is in order the pump is faulty.

Too much air in the system

Vent the system.

Deviation in the flow or return temperature sensor

Check that the sensors are working; take the sensors out * and measure the resistance with a multimeter at room temperature (20 – 25°C); the sensor is working properly if the resistance is between 12 and 15 kΩ.

E2

Return temperature is higher than the flow temperature

Insufficient water

Check the minimum water pressure, read off the gauge.

No through flow

Check that the pump is working; turn the spindle with a screwdriver, if that works but the pump still does not respond, check the wiring; that is in order the pump is faulty.

Too much air in the system

Vent the system.

Sensors not wired correctly

Check the wiring between sensors and control unit.

Deviation in the flow or return temperature sensor

Check that the sensors are working; take the sensors out * and measure the resistance with a multimeter at room temperature (20 – 25°C); the sensor is working properly if the resistance is between 12 and 15 kΩ.

E3

Control unit or earth fault

Mains supply not correctly earthed. Control unit faulty

Check that the power supply from the switch spur is properly earthed, if that is the case the control unit is faulty.

E4

More than 5 start
attempts without any flame formation

No ignition spark

Check:
• the connection between the ignition wire and the ignition trafo;
• the ignition wire and electrode for ‘dielectric breakdown’;
• the inter-electrode distance, this should be 3-4mm; that the ignition electrode is properly earthed.

A spark but no flame

Check that:
• the gas tap is open;
• the gas pre-pressure is sufficient;
• the gas pipe is de-aerated;
• the gas valve is energised during ignition and opens;
• the electrode is correctly fitted and clean;
• the CO2 adjustment at low and full load;
• there is no obstruction / fitting fault in the gas pipe;
• there is no obstruction in the air supply or flue (e.g. a blocked siphon); there is no recirculation of flue gasses (either inside or outside the boiler).

There is a flame but no, or insufficient ionisation (lower than 3 or higher than 9 µA)

Check:
• the flame, is the heart of the flame visible and the flame stable?
• the CO2 adjustment at low and full load;
• that the ignition electrode is correctly earthed;
• visual check of the ignition/ionisation electrode: look for white oxide film
(remove with sandpaper or a screwdriver); look at the shape (are the pins still the original shape and is the distance between the two ends of the pins between 3 and 4mm).

E5

No ionisation or ionisation failure more than 5 times during one heat demand

CO2 wrongly adjusted

Check:
• CO2 adjustment on the gas block;
• ignition/ionisation pin;
• flue/air-supply connections;
• gas flow at full load;
• if there is no recirculation of flue gasses (either inside or outside the boiler).

E6

Unwanted flame formation

Faulty control unit, replace control unit.

E7

No water in the boiler or the pump is not working

Insufficient water

Check the minimum water pressure, read off the gauge and check for leaks.

No through flow

Check that the pump is working; turn the spindle with a screwdriver, if that works but the pump still does not respond, check the wiring; that is in order the pump is faulty.

Too much air in the system

Vent the system.

Wrong pump wiring

Check wiring from and to control unit.

E8

Fan fault

Fan is not working

Check:
• fan function;
• fan wiring and connection.

Fan does not stop

Check:
• fan function;
• fan wiring and connection;
• excess chimney draught.

E10

No through flow during venting cycle

Insufficient water

Check the minimum water pressure, read off the gauge and check for leaks.

No through flow

Check that the pump is working; turn the spindle with a screwdriver, if that works but the pump still does not respond, check the wiring; that is in order the pump is faulty.

Too much air in the system

Vent the system.

Wrong pump wiring

Check wiring from and to control unit.

E11

Air box temperature
to high

Air leakage from heat exchanger
to air box

Check:
• the sealing of the viewing glass;
• whether front plate of heat exchanger is properly tightened
• front plate sealing;
• whether ignition electrode is properly fitted.

E13

Heat-exchanger fuse protection has responded; replace the heat exchanger after finding and solving the cause

Heat exchanger faulty

Check wiring between heat exchanger fuse.

Insufficient water

Check the minimum water pressure, read off the gauge and check for leaks.

No through flow

Check that the pump is working; turn the spindle with a screwdriver, if that works but the pump still does not respond, check the wiring; that is in order the pump is faulty.

E43

Parameter limits

Automation settings

Replace dF / dU settings

E44

Parameter check

Automation settings

Replace dF / dU settings.

E45

Default Parameter

Automation settings

Replace boiler control unit.