BoilerFaultCodesWhat the manual says
Manufacturer manualAnti-Legionella does not Operate
What causes this fault?
This fault occurs when the system is unable to heat the water in your cylinder to the high temperature required to kill bacteria within the set timeframe. The most common reason is a failed immersion heater element or a faulty sensor that is incorrectly reporting the water temperature. It can also be triggered if the immersion heater has been manually turned off at the isolating switch, preventing the disinfection cycle from starting.
DIY fix possible
Check that your hot water cylinder immersion heater switch is turned on and hadn't tripped.Ensure hot water schedule allows enough time for the tank to reach 60-65°C.Restart the heat pump control panel to clear the temporary warning.
Avoid the next call-out bill
A cover plan would handle faults like 9.1.36: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.