Viessmann 100W fault Code: F1 and now F2

S

Samc1987

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21 Feb 2016
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Lincoln
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United Kingdom
The central heating has been off for a couple of months now.

I turned all the upstairs radiators off and drained the system the other week as I was removing the radiators downstairs, ready to decorate/ install new ones, the hot water has been working fine ever since with no problems.

Today I removed the last radiator but later on when I went to use the hot water, it came out cold.

I went to the boiler which is upstairs, and it was showing an F1 code.

I Turned off and Reset the boiler, with no joy, so topped the system up, bleed the rads and it's now showing an F2 code.

I can't get rid of this F2 code, any ideas what may have happened, and how i could fix it?

Sam
 
You need to follow the venting procedure in the Installation & Service instructions.
 
f1 as above going to f2 is probably over heating because lack of water , not venting , tripping over heat so fill the system properly and vent before wrecking your boiler ,
 
At pressure and all vented.

Any ideas what may have happened, as the hot tap was only on for around 30 seconds before I turned it off and went to check the boiler.

According to the manual, the temperature limiter may have gone.

I would need a multimeter to double check.
 
the temp limiter has re set itself , why do you need to test it

do you mean resetting by dial ?
 
Last edited:
Gone as in failed, manual is saying it needs testing to determine if it needs replacing.
It's been reset.
 
so its still faulting after filling and venting ? you shouldn't take cover off anyway
 
Last edited:
if you've tried reset and or venting( as above) you need rgi to look at it
 
Vented the mag clean and all remaining rads. Then filled again to 1.5 bar
I have the feeling it's probably going to be a call out now.
 
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