Question 1

Central heating stops working after some time

Accepted Answer

Possible cause: Incorrect non-return valve orientation. Make sure the non-return valves are fitted facing the right way.

Question 2

No continuous hot water

Accepted Answer

Possible cause: Hot Water Boost switches itself off automatically after 30 minutes.. Activate Hot Water Boost again.

Question 3

No continuous hot water

Accepted Answer

Possible cause: 'Aux Hot Water Tank' is not selected in installed accessories. In the Installed Accessories menu, confirm the 'Aux Hot Water Tank' option has a tick.

Question 4

No continuous hot water

Accepted Answer

Possible cause: Air trapped in the system. Bleed the system of air.

Question 5

No continuous hot water

Accepted Answer

Possible cause: Circulation pump not connected properly to options dongle. Make sure the 12V circulation pump is properly connected to the options dongle.

Question 6

No continuous hot water

Accepted Answer

Possible cause: Gas and electric heating not both selected or functioning. Confirm the gas heating and the electric heating are each switched on and working.

Question 7

No continuous hot water

Accepted Answer

Possible cause: Circulation pump lacks power or is malfunctioning. Make sure the 12V circulation pump is actually receiving power and running.

Question 8

'Aux Hot Water Tank' isn't listed in the Installed Accessories menu

Accepted Answer

Possible cause: Options dongle is not properly connected to the boiler. Confirm the options dongle is properly connected to the Compact HE boiler.

Question 9

'Aux Hot Water Tank' isn't listed in the Installed Accessories menu

Accepted Answer

Possible cause: Power supply needs a reset to clear saved behaviours after connection. After connecting the options dongle, disconnect and reconnect the boiler's 12V power supply to clear any saved settings.

Question 10

Noise from 12 V circulation pump

Accepted Answer

Possible cause: Air trapped in the system. Bleed the system of air.

Question 11

No water comes out even though the tap is open

Accepted Answer

Possible cause: Vehicle fresh water pump is turned off or not working. Confirm the fresh water pump in the vehicle has been switched on.

Question 12

No water comes out even though the tap is open

Accepted Answer

Possible cause: Ice plugs present in the water tank or pipes. Check there's no ice blocking the water tank or pipes.

Question 13

No water comes out even though the tap is open

Accepted Answer

Possible cause: Draining valves or FrostControl are open. Make sure all the draining valves and FrostControl are closed.

Question 14

The tap runs but no warm water comes out

Accepted Answer

Possible cause: Water pump malfunctioning or lack of water supply in tank. Confirm the vehicle's water pump is working and that there's actually a water supply.

Question 15

The 'Aux Hot Water Tank' icon is flashing

Accepted Answer

Possible cause: The water's still in its heating cycle.. Just wait for the heating cycle to complete - the icon switches to solid once the water reaches 60°C.

Alde Flow

Technical Specifications

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	Central heating stops working after some time	Incorrect non-return valve orientation	Make sure the non-return valves are fitted facing the right way.	DIY Safe
`N/A`	No continuous hot water	Hot Water Boost switches itself off automatically after 30 minutes.	Activate Hot Water Boost again.	DIY Safe
`N/A`	No continuous hot water	'Aux Hot Water Tank' is not selected in installed accessories	In the Installed Accessories menu, confirm the 'Aux Hot Water Tank' option has a tick.	DIY Safe
`N/A`	No continuous hot water	Air trapped in the system	Bleed the system of air.	DIY Safe
`N/A`	No continuous hot water	Circulation pump not connected properly to options dongle	Make sure the 12V circulation pump is properly connected to the options dongle.	DIY Safe
`N/A`	No continuous hot water	Gas and electric heating not both selected or functioning	Confirm the gas heating and the electric heating are each switched on and working.	DIY Safe
`N/A`	No continuous hot water	Circulation pump lacks power or is malfunctioning	Make sure the 12V circulation pump is actually receiving power and running.	DIY Safe
`N/A`	'Aux Hot Water Tank' isn't listed in the Installed Accessories menu	Options dongle is not properly connected to the boiler	Confirm the options dongle is properly connected to the Compact HE boiler.	DIY Safe
`N/A`	'Aux Hot Water Tank' isn't listed in the Installed Accessories menu	Power supply needs a reset to clear saved behaviours after connection	After connecting the options dongle, disconnect and reconnect the boiler's 12V power supply to clear any saved settings.	DIY Safe
`N/A`	Noise from 12 V circulation pump	Air trapped in the system	Bleed the system of air.	DIY Safe
`N/A`	No water comes out even though the tap is open	Vehicle fresh water pump is turned off or not working	Confirm the fresh water pump in the vehicle has been switched on.	DIY Safe
`N/A`	No water comes out even though the tap is open	Ice plugs present in the water tank or pipes	Check there's no ice blocking the water tank or pipes.	DIY Safe
`N/A`	No water comes out even though the tap is open	Draining valves or FrostControl are open	Make sure all the draining valves and FrostControl are closed.	DIY Safe
`N/A`	The tap runs but no warm water comes out	Water pump malfunctioning or lack of water supply in tank	Confirm the vehicle's water pump is working and that there's actually a water supply.	DIY Safe
`N/A`	The 'Aux Hot Water Tank' icon is flashing	The water's still in its heating cycle.	Just wait for the heating cycle to complete - the icon switches to solid once the water reaches 60°C.	DIY Safe