BoilerFaultCodesYour boiler is simply showing you the current hot water temperature setting so you can adjust it to your preference.
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: DHW temperature selected (by knob). Adjust if required - 55°C recommended. Range: 65°C(winter) - 45°C(summer)
What causes this fault?
This is not a mechanical failure but rather a status notification triggered when the user-adjustable hot water control knob is turned. It appears to confirm the specific target temperature you have set for your taps and showers, ensuring the boiler heat exchanger knows exactly how much to heat the water.
This code is often seen during the transition between seasons when homeowners adjust the dial higher for winter comfort or lower for energy saving in summer.
DIY fix possible
Locate the domestic hot water (DHW) control knob on the boiler panel.Turn the knob to your desired temperature, ideally around 55°C for standard use.Check that the display updates to your new selection and then returns to the normal operating screen.
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 U60 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Powermax HE 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.