BoilerFaultCodes f[ xx Low
Your boiler is simply performing a routine system check or displaying its internal software version, which is a normal operation and not a fault.
Monitor it
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Venting cycle/Software version number (Not a fault)
DIY fix possible
Wait a few minutes for the cycle to finishMonitor the display to see if it returns to showing the current water temperatureNo action is required as this is not a fault
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like f[ xx — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Remeha Avanta 18V is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.