F76 Error Code - Valliant EcoTechPro Boiler
- Thread starter vichy
- Start date
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Doesn't matter if it's only 2 weeks old, this fault code is the HE last resort overhheat stat tripped out, usually HE has been damaged.
Had the boiler/system been drained and re-filled just before this happened?
Had the boiler/system been drained and re-filled just before this happened?
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mines got the same problem on sun 17 feb boiler went off
two years old three week out of warranty
this is the reply
Thank you for your recent enquiry.
As the manufacturers of your appliance we do have our own specialist engineers based nationwide. Our current fixed price call out fee is £210.00 inclusive of call out, labour, the majority of components (excluding the main heat exchanger and expansion vessel) and VAT.
However, if our engineer identifies that the problem you are currently experiencing is due to any problem with the design or manufacture of the boiler, charges will be refunded as necessary.
I have been advised by our technical department that the F76 fault code indicates an overheat problem which may be related to the plate to plate heat exchanger.
two years old three week out of warranty
this is the reply
Thank you for your recent enquiry.
As the manufacturers of your appliance we do have our own specialist engineers based nationwide. Our current fixed price call out fee is £210.00 inclusive of call out, labour, the majority of components (excluding the main heat exchanger and expansion vessel) and VAT.
However, if our engineer identifies that the problem you are currently experiencing is due to any problem with the design or manufacture of the boiler, charges will be refunded as necessary.
I have been advised by our technical department that the F76 fault code indicates an overheat problem which may be related to the plate to plate heat exchanger.
As usual Glow Worm numpties replying haven't a clue what Vaillant fault codes are
who's a glowworm numpty?
as regards to the F76, the thermal fuse has tripped, and you need a new heat exchanger. However, you might want to wonder why this has happened in the first place to prevent it happening again. Dry firing is a common cause
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in Jan 2018 I also had the dreaded F76 fault code appear on our Vaillant ecoTEC 630 +. I was also able to restart /relight boiler on a few occasions which stayed on for progressively shorter periods of times over a couple of days. I called out local heating engineer who diagnosed failed thermal fuse on the top of the hear exchanger which is not a replaceable part (for safety reasons). He told me that the entire heat exchange needed to be replaced with an estimated cost of the HE replacement only at over £1k inc parts/labour. He then advised me that a new boiler was my best option (@ £1.6K -£1.8k inc fitting).
Anyway I decided to get a second opinion from Valliant directly. I told them the boiler was already broken and to my surprise they were happy to offer me their platinum breakdown cover @ £250 for 6 month cover which covered me for any repair required up to a total of £1500 during the 6 month period - Needless to say I almost bit their hand off and I signed up. The Vaillant engineer came out within 24 hours , replaced the heat exchanger , upgraded a number of pipes as a preventative measure , replaced the water pressure sensor , replaced the 10 liter expansion tank which wasn't holding the required 1 bar pressure , and exchanged the Wilo pump for a more reliable Grunfoss pump and recommissioned the system all in less than 2 hours . Had i purchased all these part individually it would have cost me more than £800 and the fitting/labour would be on top. So I have almost an entirely reconditioned boiler and all it cost me was £250. I am delighted with Vaillant beyond my wildest expectations. Their customer service was outstanding. Most local heating company are aware of this breakdown cover offered by Vaillant and many don't want you to know about it as they would much prefer that you deal with them so that they can charge you a small fortune for repair parts/labour.
Anyway I decided to get a second opinion from Valliant directly. I told them the boiler was already broken and to my surprise they were happy to offer me their platinum breakdown cover @ £250 for 6 month cover which covered me for any repair required up to a total of £1500 during the 6 month period - Needless to say I almost bit their hand off and I signed up. The Vaillant engineer came out within 24 hours , replaced the heat exchanger , upgraded a number of pipes as a preventative measure , replaced the water pressure sensor , replaced the 10 liter expansion tank which wasn't holding the required 1 bar pressure , and exchanged the Wilo pump for a more reliable Grunfoss pump and recommissioned the system all in less than 2 hours . Had i purchased all these part individually it would have cost me more than £800 and the fitting/labour would be on top. So I have almost an entirely reconditioned boiler and all it cost me was £250. I am delighted with Vaillant beyond my wildest expectations. Their customer service was outstanding. Most local heating company are aware of this breakdown cover offered by Vaillant and many don't want you to know about it as they would much prefer that you deal with them so that they can charge you a small fortune for repair parts/labour.
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in Jan 2018 I also had the dreaded F76 fault code appear on our Vaillant ecoTEC 630 +. I was also able to restart /relight boiler on a few occasions which stayed on for progressively shorter periods of times over a couple of days. I called out local heating company who claimed Vaillant 'accreditation' and who diagnosed (correctly) a failed thermal fuse which is not a replaceable part (for safety reasons). I was advised that the heat exchange needed to be replaced with an estimated cost of replacement at over £1k inc parts/labour. He then advised me that a new boiler was my best option (@ £1.6K -£1.8k inc fitting).
Anyway I decided to get a second opinion from Valliant directly. I told them the boiler was already broken and to my surprise they were happy to offer me their Platinum breakdown cover @ £250 for 6 month cover which covered me for any repair required up to a total of £1500 during the 6 month period. Needless to say I almost bit their hand off and I signed up.
The Vaillant engineer came out within 24 hours , he replaced the heat exchanger, upgraded a number of internal pipes as a preventative measure , he replaced the water pressure/flow sensor , he replaced the 10 liter expansion tank which wasn't holding the required 1 bar pressure ,he swapped out the (unreliable) Wilo pump for a (more reliable) Grunfoss pump and he recommissioned the system all in less than 2 hours. Had i purchased all these parts individually it would have cost me in excess of £800 and the fitting/labour would be in addition. So I have almost an entirely new/reconditioned boiler and all it cost me was £250. I am delighted with Vaillant beyond my wildest expectations. Their customer service was outstanding.
My (maybe cynical) view now is that I think that most local heating companies are aware of this Vaillant breakdown cover but they don't want you to know about it as they would much prefer that you deal directly with them so that they can charge you a small fortune for parts/labour repair. Had i not contacted Vaillant directly for a 2nd opinion , then I would have probably gone with the advice of the local heating company and replaced the boiler - so by contacting Vaillant I saved myself £1.5k.
Anyway I decided to get a second opinion from Valliant directly. I told them the boiler was already broken and to my surprise they were happy to offer me their Platinum breakdown cover @ £250 for 6 month cover which covered me for any repair required up to a total of £1500 during the 6 month period. Needless to say I almost bit their hand off and I signed up.
The Vaillant engineer came out within 24 hours , he replaced the heat exchanger, upgraded a number of internal pipes as a preventative measure , he replaced the water pressure/flow sensor , he replaced the 10 liter expansion tank which wasn't holding the required 1 bar pressure ,he swapped out the (unreliable) Wilo pump for a (more reliable) Grunfoss pump and he recommissioned the system all in less than 2 hours. Had i purchased all these parts individually it would have cost me in excess of £800 and the fitting/labour would be in addition. So I have almost an entirely new/reconditioned boiler and all it cost me was £250. I am delighted with Vaillant beyond my wildest expectations. Their customer service was outstanding.
My (maybe cynical) view now is that I think that most local heating companies are aware of this Vaillant breakdown cover but they don't want you to know about it as they would much prefer that you deal directly with them so that they can charge you a small fortune for parts/labour repair. Had i not contacted Vaillant directly for a 2nd opinion , then I would have probably gone with the advice of the local heating company and replaced the boiler - so by contacting Vaillant I saved myself £1.5k.
Last edited:
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Hi, I recently had a f76 code come up on my VAILLANT boiler. After letting it cool down and then resetting it, the code would disappear and the boiler would relight. I got a second hand thermal fuse of eBay for £19, now the boiler works perfectly and has done for over 1 week on Ch and dhw. Obviously a faulty thermal fuse not a heat exchange and saved myself £100's.
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