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Here is a list of common boiler fault codes

Vaillant boiler fault code

F75

Vaillant boiler fault code F75

No pressure change

Change detection when starting pump. Water pressure sensor and/or pump defective, air in heating installation, too low water pressure in boiler; check adjustable bypass, connect external expansion vessel to return

F.22

Vaillant boiler fault code F.22

Low water in system

low water pressure. No or to low water pressure in the boiler, water pressure sensor defective, cable to pump or water pressure sensor loose/not connected/defective

F.32

Vaillant boiler fault code F.32

Speed deviation Fan

Plug at fan not correctly plugged in, multiple plug on PCB not correctly plugged in, break in cable harness, fan blocked, Hall sensor defective, electronics defective

F.24

Vaillant boiler fault code F.24

Low water or Pump failure

Plug at fan not correctly plugged in, multiple plug on PCB not correctly plugged in, break in cable harness, fan blocked, Hall sensor defective, electronics defective.

F.72

Vaillant boiler fault code F.72

Flow And/Or Return NTC Fault

Flow/return NTC temperature difference too great -> flow and/or return temperature sensor defective

F.62

Vaillant boiler fault code F.62

Gas Valve ShutOff Delay

Delayed shutdown of gas valve - Delayed extinguishing of flame signal - Gas valve leaking - Electronics defective

Ideal boiler fault code

F1

Ideal boiler fault code F1

Low Water Pressure

Check system pressure is between 1 & 1.5bar on the pressure gauge. If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII)

L1

Ideal boiler fault code L1

Flow Temperature Overheat

Check system pressure is between 1 & 1.5bar on the pressure gauge. If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII)

L3

Ideal boiler fault code L3

No Water Flow

Check system pressure is between 1 & 1.5bar on the pressure gauge. If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII)

F2

Ideal boiler fault code F2

Flame Loss

1. Check other gas appliances in the house are working to confirm a supply is present in the property. 2. If other appliances do not work or there are no other appliances, check the gas supply is on at the meter and/or pre payment meter has credit. If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII).

L2

Ideal boiler fault code L2

Flame Loss

1. Check other gas appliances in the house are working to confirm a supply is present in the property. 2. If other appliances do not work or there are no other appliances, check the gas supply is on at the meter and/or pre payment meter has credit. If the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII).

F3

Ideal boiler fault code F3

Fan Fault

Reset the appliance - if the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII).

F4

Ideal boiler fault code F4

Flow Thermistor

Flow thermistor Reset the appliance - if the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII).

F5

Ideal boiler fault code F5

Return Thermistor

Reset the appliance - if the boiler fails to operate then please contact Ideal (if under warranty) or alternatively a Gas Safe Registered Engineer if outside of the warranty period. In IE contact a Registered Gas Installer (RGII).