Medium
F51 on ECA Confeo Premix HM

Your boiler has detected a problem with the temperature sensor for your solar heating system, which is causing the unit to stop operating as a precaution.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

PT1000 Solar Sensor Error (blocking) — PT1000 solar sensor may be defective; press Reset; if persists notify ECA authorised service

Shared across the Confeo Premix P range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Locate the 'Reset' button on the boiler control panel.Press and hold the button for 3 seconds to clear the fault.If the error returns immediately or frequently, contact a qualified technician to check the sensor wiring.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like F51: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related fault codes

F50View →F52View →

All 38 fault codes on the Confeo Premix HM

Seeing a different code? Every code this model can display, in one place.

E01E02E03E15E16E17E18E33E35E38E44E64E65E80E82E83E98E99F05F07F10F13F34F36F37F39F40F41F42F43F47F49F50F52F53F81F201

Related guides you might find useful

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

Boiler service cost

What a UK service costs and what a proper one includes.

Read →