Vaillant f75

[rayplumber]

Hello heating gods I am a Vaillant approved installer and until lately have considered Vaillant to be the best on the market this week I have had 3 boilers go down with f75 Vaillant say its sludge but one of the boilers was only installed in September, when we install our boilers we do a power flush to kamco specifications using fx2 and we never cut corners on it, we always install adey magnaclean 2 filters, it doesn't help Vaillant or my business when the Vaillant engineer blames installer error causing my customers to kick off with me as they have paid for a power flush is anyone else having this problem I have added a picture of the water sample Vaillant left with the customer I think I have anyway

 

[Super Mario]

You sure that samples from the boiler?

 

[PhoenixServices]

I have had the same problem with Vailliant/Glowworm group.
All boilers installed with magnacleans, power flushed.
Even on new heating systems. I don't fit them anymore.

 

[Sharp Point]

It's exactly because of this I stopped fitting them, their water pressure sensor is of very poor design, usually the reason of f75 fault.

Oh and their crap stainless micro bore wound type heat exchanger.

 

[walterwhite]

I only fit Vaillants and haven't had this problem yet. Hope I'm not tempting fate!

 

[macackau]

I only fit Vaillants and haven't had this problem yet. Hope I'm not tempting fate!

Same here. Never had a problem touch wood, I fit spirotraps as a filter.

 

[AllyBongo]

F75 may not have happened yet guys, but when you drain a Vaillant during service and the digital gauge read 0.5bar, F75 is not far away............

 

[AllyBongo]

Looks more like the Vaillant engineers urine sample! Hope he's not away to his GP with the heating sample!

 

[Whyme]

We started fitting vaillants when they had rubber hoses in them, f75 from the off and leaking diverters and popped hoses. complete overhaul f75 still leaking diverters then they changed the pump cos of problems. all apparently due to installer error. yeah right o. we don't fit them anymore very expensive and the competition
has caught up. Plus they try and pinch your custom why bother

 

[Whyme]

It's exactly because of this I stopped fitting them, their water pressure sensor is of very poor design, usually the reason of f75 fault.

Oh and their crap stainless micro bore wound type heat exchanger.

Thats the same heat ex the vast majority of drum style boilers have excluding viessman who make there own its called a gianni if i remember right (the vaillant and co one )

 

[walterwhite]

F75 may not have happened yet guys, but when you drain a Vaillant during service and the digital gauge read 0.5bar, F75 is not far away............

I've drained plenty down....still hasn't happened to me yet!

 

[stevetheplumber]

i was a life long vailant fan and i have to agree that they are not what they were i remove my of vailant last year and it still had the same thermocouple gas valve pcb and heat exchanger
they are now no better than the glowworms

 

[gassafe]

F75 may not have happened yet guys, but when you drain a Vaillant during service and the digital gauge read 0.5bar, F75 is not far away............

Can you explain some more... I noticed on my last vaillant service the digital gauge was reading like 1.7 bar but the manual gauge looked very low... Upon finishing the service I had an f75 fault... I just topped it up & it went away but I was concerned about the difference in digital & manual gauge!

I hate vaillant, what's with the manual gauge with no numbers!!!?? no use to anyone!

 

[Whyme]

the pressure sensor senses low pressure and pump pressure ie when its running. its a duel tool.a way to trick it if partially blocked is to increase the pressure. ignore the manual gauge, get the bar up on the display when the pump kicks in at normal pressure if i doesn't change then its the sensor. there famously crap.

 

[kozak1968]

I think Vaillant as a company are nowhere as good as 5 years ago. The help line needs to be sorted and I hate to say it but they could take a leaf out of the Worcester Bosch book.

 

[cdodds2004]

there warranty repair is a joke! they always try to blame installer etc! i havnt fitted one for years! if a boiler has been flushed, has a magna clean and has inhibitor topped up every year i feel like the customer has gone above and beyond most so they should be covered by the warranty!

 

[Sharp Point]

Thats the same heat ex the vast majority of drum style boilers have excluding viessman who make there own its called a gianni if i remember right (the vaillant and co one )

You don't say! But there must be something they do that other don't, as it always seems to be vaillant a that are sensitive to crud.
And if you look at the wound stainless tubing it seems to be flattened, on purpose probably to fit more in, so it is going to even more problematic to particle build up.

 

[Dotty]

Thread moved off open forum.

 

[GrahamM]

Thats the same heat ex the vast majority of drum style boilers have excluding viessman who make there own its called a gianni if i remember right (the vaillant and co one )

Giannoni!

You don't say! But there must be something they do that other don't, as it always seems to be vaillant a that are sensitive to crud.
And if you look at the wound stainless tubing it seems to be flattened, on purpose probably to fit more in, so it is going to even more problematic to particle build up.

Its essentially the poor design of water pressure sensor that is to blame in my opinion.
It has a very narrow channel into the sensor that is easily clogged up.

 

[Sim77]

but that water sample does look dirty. FX2 not neutralized?

We install up to 20 pro and pluses a year. Never had F75. (Have been installing mostly Vaillant for 10 years now)

Had other problems but never F75.

 

[stevetheplumber]

but that water sample does look dirty. FX2 not neutralized?

We install up to 20 pro and pluses a year. Never had F75. (Have been installing mostly Vaillant for 10 years now)

Had other problems but never F75.

do you service the boilers youve fitted most boilers work out of the box its two years on the faults start to show

 

[Sim77]

yes, most of them. I sent reminders to all my clients about servicing. Generally I find Vaillant very reliable. I have seen f75 on Vaillant but not on our installs yet. Usually it was blocked canoe filter or flat expansion vessel.

I had some call backs and had to ring Vaillant under warranty on our installs but not for F75.

 

[lame plumber]

been to 3 vaillants this weak, all leaking like sieves...not sure whether to hate them or be happy with the money coming in, one thing is for sure, I would never tell a customer to have one

 

[Lee]

One other cause could be too much inhibitor. This causes it to froth up in the pump and the pressure sensor cannot detect a pressure drop with proves the pump function. This can happen sometime after install as it takes a while to froth. You can see this if you take the pump head off and find a white residue. Easy fix, flush through with some fresh water.

 

[Millsy 82]

I've had f75 loads of times as the last 2 companies that I worked for fitted a lot of them.

The pressure sensors and pumps on them are shocking! Even with the new position of the pressure sensor they kept coming up with the fault.

They are nice and easy to work on but they are not worth the money any more.