I have written about the Lamona (Howden) inner door glass once before.
It seems like the problem of the inner door glass shattering is
greater than I originally thought, therefore I have decided to
investigate the matter thoroughly.

The Reason

My research proves that the reason behind the shattered glass is a
design flaw. It seems to me like the two fitting screws on each side
of the glass put enormous pressure on the glass during cooking. During
the cooking cycle heat of up 250C force the glass and screws to expand
and then shrink back again to it's original size when the oven cools
down. However glass and metal don't expand and shrink in the same way
(this is down to the physic properties known as Thermal Expansion).
The process creates huge forces (Mechanics: Stress) between glass and
screws. Unfortunately glass is not as “flexible” as metal screws,
therefore when the stress reaches a critical point glass simply
explodes in order to release accumulated energy.

Conditions

I have conducted a survey amongst customers who had their Lamona oven
glass shatter, and here are some key facts:

1. The average lifespan of the oven glass seems to be about 9-12
months

2. It appears that there are more chances that your oven glass
will explode if you tamper with the fixing, i.e. you unscrew the glass
in order to clean it and then screw it back again.

Affected Models

Lamona appliances are made by numerous manufacturers therefore the
same glass is not used in all Lamona ovens. Here’s the list of
affected models that we know of:

Lamona:

HJA3200, HJA3242, HJA3310, HJA4600, HJA3202, HJA3300, HJA3313,
HJA4610, HJA3240, HJA3303, HJA3650

Beko:

8540MB, BE62SSX, BE66FCHX, BE68MSX, 8540MX, BE63FCHX, BE66FSW,
BE92FVW, 9908MB, BE63FGHX, BE66FSX, BE92FVX, 9908MW, BE63FGHXP,
BE66MSW, CIF207000MX, 9908MX, BE65FCHW, BE66MSX, CIG200000MB, AFO60X,
BE65FGHW, BE66SSW, CIG200000MW, APG60X, BE65FGHW/1, BE66SSX,
CIG201000MB, B61GHFX, BE65FGHX, BE68FSK, CIG201000MW, B61GHFXP,
BE65FGHX/1, BE68FSW, CIG201000MX, BE61FSW, BE65FGHXP, BE68FSX,
CIG202000MX, BE61FSX, BE65FSW, BE68MSK, CIG202001MX, BE62SSW, BE65FSX,
BE68MSW, CIG203001MX

Where to buy?

You can get your Lamona Oven Glass from either
http://sparesmarket.co.uk/parts/view...20(Howden)/183 or
parts-central.co.uk

Are you advertising the glass or warning against the oven?

On Oct 28, 1:38*am, Weatherlawyer wrote:
Are you advertising the glass or warning against the oven?

There's a significant problem with the oven design, and I took this
matter personally as I am the unlucky owner of the oven myself. It
seems like most of people have to replace oven glass sooner or later.
In my professional life I am an engineer and there has been no day for
the past months without broken Lamona oven glass.

On my blog I have mention the matter back few moths ago and it started
a huge debate. It seems like the manufacturer doesn’t seem to
acknowledge the problem, as long as people will continue to buy
replacement glass.
Furthermore, Lamona is not a manufacturer but a “mashup” of various
brands including Beko, Belling, Whirlpool, etc. therefore there is no
one to take the blame for the design.

As per advertising, I got the links from Google top results. People
often ask me where they can get the glass from. I have no preference
nor I am associated with either company in any form.

On Oct 27, 9:28*pm, kris wrote:
I have written about the Lamona (Howden) inner door glass once before.
It seems like the problem of the inner door glass shattering is
greater than I originally thought, therefore I have decided to
investigate the matter thoroughly.

*The Reason

My research proves that the reason behind the shattered glass is a
design flaw. It seems to me like the two fitting screws on each side
of the glass put enormous pressure on the glass during cooking. During
the cooking cycle heat of up 250C force the glass and screws to expand
and then shrink back again to it's original size when the oven cools
down. However glass and metal don't expand and shrink in the same way
(this is down to the physic properties known as Thermal Expansion).
The process creates huge forces (Mechanics: Stress) between glass and
screws. Unfortunately glass is not as “flexible” as metal screws,
therefore when the stress reaches a critical point glass simply
explodes in order to release accumulated energy.

*Conditions

I have conducted a survey amongst customers who had their Lamona oven
glass shatter, and here are some key facts:

1. * * The average lifespan of the oven glass seems to be about 9-12
months

2. * * It appears that there are more chances that your oven glass
will explode if you tamper with the fixing, i.e. you unscrew the glass
in order to clean it and then screw it back again.

Affected Models

Lamona appliances are made by numerous manufacturers therefore the
same glass is not used in all Lamona ovens. Here’s the list of
affected models that we know of:

Lamona:

HJA3200, HJA3242, HJA3310, HJA4600, HJA3202, HJA3300, HJA3313,
HJA4610, HJA3240, HJA3303, HJA3650

Beko:

8540MB, BE62SSX, BE66FCHX, BE68MSX, 8540MX, BE63FCHX, BE66FSW,
BE92FVW, 9908MB, BE63FGHX, BE66FSX, BE92FVX, 9908MW, BE63FGHXP,
BE66MSW, CIF207000MX, 9908MX, BE65FCHW, BE66MSX, CIG200000MB, AFO60X,
BE65FGHW, BE66SSW, CIG200000MW, APG60X, BE65FGHW/1, BE66SSX,
CIG201000MB, B61GHFX, BE65FGHX, BE68FSK, CIG201000MW, B61GHFXP,
BE65FGHX/1, BE68FSW, CIG201000MX, BE61FSW, BE65FGHXP, BE68FSX,
CIG202000MX, BE61FSX, BE65FSW, BE68MSK, CIG202001MX, BE62SSW, BE65FSX,
BE68MSW, CIG203001MX

Where to buy?

You can get your Lamona Oven Glass from eitherhttp://sparesmarket.co.uk/parts/view/11421/Lamona%20(Howden)/183or
parts-central.co.uk

It's normal practice to have soft washers under the fixing screw
washers to prevent this.

I'd have thought the industry would have this sort of thing sorted by now,
maybe using some form of pliable material which is good for the
temperatures. I can well remember my Mothers old Belling cooker glass always
breaking back in the 70s. this had some kind of bonded metal fittings which
I have no doubt were half the problem.
Can't get the designers I guess.

Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"kris" wrote in message
...
I have written about the Lamona (Howden) inner door glass once before.
It seems like the problem of the inner door glass shattering is
greater than I originally thought, therefore I have decided to
investigate the matter thoroughly.

The Reason

My research proves that the reason behind the shattered glass is a
design flaw. It seems to me like the two fitting screws on each side
of the glass put enormous pressure on the glass during cooking. During
the cooking cycle heat of up 250C force the glass and screws to expand
and then shrink back again to it's original size when the oven cools
down. However glass and metal don't expand and shrink in the same way
(this is down to the physic properties known as Thermal Expansion).
The process creates huge forces (Mechanics: Stress) between glass and
screws. Unfortunately glass is not as “flexible” as metal screws,
therefore when the stress reaches a critical point glass simply
explodes in order to release accumulated energy.

Conditions

I have conducted a survey amongst customers who had their Lamona oven
glass shatter, and here are some key facts:

1. The average lifespan of the oven glass seems to be about 9-12
months

2. It appears that there are more chances that your oven glass
will explode if you tamper with the fixing, i.e. you unscrew the glass
in order to clean it and then screw it back again.

Affected Models

Lamona appliances are made by numerous manufacturers therefore the
same glass is not used in all Lamona ovens. Here’s the list of
affected models that we know of:

Lamona:

HJA3200, HJA3242, HJA3310, HJA4600, HJA3202, HJA3300, HJA3313,
HJA4610, HJA3240, HJA3303, HJA3650

Beko:

8540MB, BE62SSX, BE66FCHX, BE68MSX, 8540MX, BE63FCHX, BE66FSW,
BE92FVW, 9908MB, BE63FGHX, BE66FSX, BE92FVX, 9908MW, BE63FGHXP,
BE66MSW, CIF207000MX, 9908MX, BE65FCHW, BE66MSX, CIG200000MB, AFO60X,
BE65FGHW, BE66SSW, CIG200000MW, APG60X, BE65FGHW/1, BE66SSX,
CIG201000MB, B61GHFX, BE65FGHX, BE68FSK, CIG201000MW, B61GHFXP,
BE65FGHX/1, BE68FSW, CIG201000MX, BE61FSW, BE65FGHXP, BE68FSX,
CIG202000MX, BE61FSX, BE65FSW, BE68MSK, CIG202001MX, BE62SSW, BE65FSX,
BE68MSW, CIG203001MX

Where to buy?

You can get your Lamona Oven Glass from either
http://sparesmarket.co.uk/parts/view...20(Howden)/183 or
parts-central.co.uk

This is the recent update on the Lamona Oven Glass I have found:

I have written about the exploding inner oven glass for Lamona ovens many times before. This is quick follow up on my enquiry in to the matter:

Recently Howdens (supplier of Lamona appliances) started to tell affected customers that the reason behind the breaking glass is the way the customer treats the oven. Apparently cleaning the oven with some heavy-duty cleaners may remove the heatproof layer from the inner door glass – at least that’s what Howdens has been telling some of its customers.

I didn’t buy that and continued with my private investigation. I have managed to gather following facts.

The facts:
The inner oven glass we talk about is manufactured by Beko and fits around 160 oven models of various makes: Beko, Belling, Flavel, Lamona and others.
The same glass fits only 11* models of Lamona (Howden) models. That’s about 6.8% of all ovens that the glass has been fitted to.
From the survey conducted amongst customers whom ordered replacement inner glasses approximately 98% where those who had Lamona ovens (we have asked for a model number and 98% of them begun with HJA, which is Lamona code).

Quick summary:

It seems that the very same glass explodes in only 6.8% of these particular ovens. In other words: mere 6.8% of ovens are responsible of 98% of accidents. Coincidence? Not a chance.

The fault:

It seems like it’s easier (definitely cheaper) to blame customers for a glass that explodes spontaneously rather than take the full responsibility for the faulty design. But which one is it? I guess the right question to ask is what causes 98% of accidents in mere 6.8% ovens. Why other makes are not affected?

The simplest answer is the design of the oven itself.

The Devil is in the Design:

Oven Glass Fittings

Lamona (Howden) 11* models.

Inner door glass is fitted by two screws on each side. The problem with this fitting has been described in here

Beko 106* models.

Inner door glass is hold by a frame and locked by locking mechanism on upper side of the door.

It seems that different fitting used by Beko solves the problem of exploding oven glass.

My advice:

Should you need to replace your oven glass (guess you are one of unlucky Lamona Howden customers) please contact manufacturer first. If your oven is less than 12 months old you should be able to get free replacement under your warranty. Don’t let them tell you that it’s your fault. We have heard from many customers whom complained that Howdens would try to blame you for the fault. Let them know that you are aware of this common problem and they probably will eventually replace the glass for you for free.

Unfortunately if your oven is more than 12 months old you will have to take care of replacing glass by yourself. Please take a special care when fitting the glass in particular not to screw the glass to tight as it may contribute to future glass failure.

*known as of the time of publishing this article.