Medium
153 on ECA FELiS FL 50 HM

Your boiler has been manually locked, likely by someone pressing the reset button for too long or a technician during maintenance.

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

The device is locked manually

Shared across the FELiS FL 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 Reset button for approximately 3 seconds.Wait for the display to clear and the boiler to restart its ignition sequence.

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 153: 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

01View →40View →

All 151 fault codes on the FELiS FL 50 HM

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

1020262830323840464750525457606568707172737882838485919899100102103105109110111117118119121122125126127128129130132133146151152160162164166169170171172173174176177178179183195196209214215216217218241242243260270317320321322323324325326327328329330331332333335336337339340341342343344345346347348349350351352353371372373374375376377378382384385386387388391392393419422423424425426427429430431432433550551809810811812813814

Related guides you might find useful

Boiler service cost

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

Read →

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →