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  • Writer's pictureJeff Culkin

Sime Boilers Safety Alert, Format C Sime Boiler PCB Fault Causing Overheat

The Gas Safe Register Recently Issued a safety Alert for Sime "Format C" boiler models 80C 100C and 110C.

A small number, below 1% have malfunctioned because a fault with the PCB (printed circuit board) leading to over heating of the appliance.

These boilers should not be used until a safety kit has been installed by a Gas Safe Registered engineer.

Contact Sime on 0845 901 1114

Or the Gas Safe Register 0800 408 5500

You can find a registered engineer on the Gas Safe web site

If you live in North West London you can contact us;

Culkin Plumbing and Heating,

Willesden Green, NW2

Primary cover NW2, NW3, NW6, NW10 and W9


Bulletin from the Gas Safe Register;

This Safety Alert has been published to highlight a possible safety issue with the Sime “Format C” boilers, models 80C, 100C and 110C. A small number of these boilers (less than 1%) have malfunctioned due to a faulty printed circuit board. This has resulted in severe overheating of the appliance.


Gas Safe registered engineers that encounter any of these boilers that are not already modified, should advise their customers immediately that the boiler should not be used until a manufacturer supplied safety kit is fitted.

The safety kit comprises of a manual reset overheat thermostat, securing spring and necessary electrical connection components Part No. 8089851. For reference safety kit installation instructions can be read here.

Action to take

It is not possible to prevent the failure of the printed circuit board.

Registered engineers are able to obtain the safety kit on a free of charge basis by contacting Sime Ltdon 0845 901 1114.

Further information

Contact Sime Ltd on 0845 901 1114 for further information regarding this issue.

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