SAFETY ALERT – August 2017


Dear Registered Engineer,

This Safety Alert (SA) provides guidance about a boiler safety concern relating to specific Baxi and Potterton heat only gas boilers. It has been identified that under certain fault conditions products of combustion can be released from the condensate trap connection.

On specific heat only boilers manufactured with a condensate trap positioned on the outside of the boiler, an unusual combination of factors occurring simultaneously (fault on fault condition) could give rise to a safety concern.

The probability of this situation occurring is very low and a recent risk analysis undertaken by Baxi, has highlighted that under these rare circumstances, there is a potential risk of products of combustion being released into the adjacent living space as the seal between the condensate trap and boiler is not contained by the outer case.

Affected models
This notice only relates to the heat only boilers listed in the Boiler Identification Table (see below) manufactured between week 17 of 2014 and week 24 of 2017. These can be identified by the modification level of the serial number.

An example of the serial number format is shown below.

Modification levels AC & BC require action, CC do not.

Boiler Identification Table

Boiler issues

Immediate Action
Baxi will arrange to supply a replacement condensate trap retaining clip assembly completely free of charge to all boilers with an AC or BC modification level, as identified in Boiler Identification Table.

When undertaking work on these boilers, Gas Safe registered engineers are advised to pay particular attention to the following details as this issue may not be immediately apparent.

When attending a heat only boiler listed in the Boiler Identification Table, first check to see if the modification level of the serial number is in the identified range. The serial number is located on the boiler data plate and/or serial number/information label.

If the boiler is found to have a modification level of AC or BC, check the condensate trap retaining clip. The condensate trap and retaining clip are located on the base of the boiler behind the User Interaction Controller/control panel (Figure 3). Removal of the User Interaction Controller/control panel facilitates inspection of the condensate trap retaining clip.

If it is the original type (Figure 1) follow the ‘Actions’ listed below. Baxi recommends that all condensate retaining clips of the original type are exchanged irrespective of their current condition.

If it is the new type (Figure 2) no further action is required under this Safety Alert. However, all boiler checks in accordance with the Gas Safety (Installation and Use) Regulations (GSIUR) 26(9) must be completed and any subsequent actions applied as appropriate.


1. If the boiler has modification level AC or BC and the condensate trap retaining clip is the original type (Figure 1) a new condensate trap retaining clip assembly should be fitted. If a replacement clip assembly is not available during the inspection, the original trap and retaining clip should be checked to ensure it is fitted in accordance with manufacturer’s instructions and, a free of charge replacement retaining clip assembly should be obtained as detailed in SA 024 and fitted as a replacement at your earliest convenience.
2. If a combustion analysis check is required as a result of any work undertaken, please refer to the appropriate Installation & Service instructions for guidance. If the customer does not have the Installation & Service instructions to hand, it can be found at 
3. If combustion performance is not in accordance with the manufacturer’s instructions, take the appropriate actions as defined in the Gas Industry Unsafe Situation Procedure (GSIUP).

For technical assistance, please call the free Baxi dedicated helpline on 0800 169 5376 or us on the above no..

Download the full Safety Alert 024


This Safety Alert (SA) has been published to provide guidance to Gas Safe Registered businesses/engineers about a product safety concern relating to two models of Bosch and Neff gas hobs.


Gas Safe Register has been advised by the manufacturer of a risk resulting from a faulty gas connector affecting two models of Bosch and Neff hobs.

Affected models
This Safety Alert concerns the following built-in gas hobs sold in the United Kingdom and the Republic of Ireland.

Product Product code Production period
Bosch built-in gas hob (knobs on the right side) NGU4151DB 2009-2011
Neff built-in gas hob (knobs on the right side) T20S31N0 2009-2011


BSH Home Appliance Ltd (BSH) has initiated this precautionary measure as, during comprehensive product monitoring and detailed research, BSH identified a potential issue regarding the gas connectors. In particular circumstances the gas connector can crack or break, which could result in an escape of gas.
What do I need to do if I own, use or service one of these hobs?
BSH is offering every owner of an affected appliance a free replacement gas connector by an authorized service engineer at the owner’s home. Any customers, gas users or registered businesses who have concerns with regards their Bosch or Neff gas hob should check whether their appliance is affected by this safety campaign.

To check whether your appliance is affected:
Note down the model number (E-Nr) and batch number (FD) on the rating plate on your appliance or original user manual.

Then check on whether your model is affected. If further assistance is required then a helpline number has been provided.

To avoid any potential risk until the gas connector has been replaced, owners of an affected appliance should turn off the gas supply to the appliance and no longer use it. If a customer is unsure how to turn off the gas supply to their hob then guidance should be sought from a suitably qualified Gas Safe registered business.

Where a Gas Safe Registered business/engineer encounters one of the affected gas hobs, the current Gas Industry Unsafe Situations Procedure (GIUSP) should be implemented and the appropriate actions and warning notices/labels completed and issued.

Note 1: The GIUSP (TB 001 can be viewed in the Technical Information section of your online account.

Any customers, gas users or registered businesses who have concerns with regards to their BSH hob can contact BSH on telephone number 0800 0287 260

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