Ideal Logic Combi 35 constant F1 fault

[pjgtech]

Hi, my Ideal Logic Combi (ESP1 / 35) has developed an F1 low water pressure fault.

Got up on Wednesday morning no hot water, (only cold water coming out of hot tap). Checked boiler, it had zero pressure and F1 fault showing. So I refilled the pressure using the filling loop, up to about 1bar which is where it usually is, which worked fine, had hot water all day.
Same thing happened on Thursday morning, got up no hot water, F1 fault, so refilled again, was ok all day.
Then same thing again today, however, after refilling to 1bar today, the pressure drops back to zero after about 10 mins.
As far as I know there are no leaks on the system, theres no water leaks showing anywhere and no damp patches?
Does anyone know what could be causing this?
NB: the boiler is only 5 to 6 years old.

EDIT: just seen another post on Ideal Logic 35 with similar issue, and a previous suggestion was that it might be a pressure sensor, or possibly a circ pump issues (as some pressure sensors do not sense the static head, but use the pressure at the pump instead?), so if an issue with the pump or sensor that could cause F1 fault? what do you think?
Thanx

 

[Deleted member 120897]

Have you checked the safety discharge pipe? Could be a passing prv.

 

[cjg]

Ideal Logic 35 refill to 1 bar and check your condesate pipe, or disconnect it and see if it drips,
sounds like you may have a cracked heat exchanger.

 

[pjgtech]

Have you checked the safety discharge pipe? Could be a passing prv.

Theres a copper discharge pipe on the outside wall, looks like nothing is coming out of that?
What looks like the condense pipe appears to go into the waste under the sink, the boiler is near the sink and its a new house 5years old, so i assume they connected condense pipe into sink waste, looks like it under the sink.

 

[Chuck]

Boiler might still be under warranty. Certainly worth checking.

 

[pjgtech]

Boiler might still be under warranty. Certainly worth checking.

Its actually 6 years old and as far as i know its not under warranty. Plus the previous owner (he owned the house for the first four years) did not have the boiler serviced, so even if it was they would probably void it!

 

[pjgtech]

Just wondered if my issue with lack of HW due to F1 (low pressure) fault could be the expansion vessel has lost pressure? I think they can be recharged can't they? assuming the diaphragm has not split....

 

[ShaunCorbs]

Nope do you have pressure in the system eg 1.2-1.5 bar ?

 

[pjgtech]

Nope do you have pressure in the system eg 1.2-1.5 bar ?

I can refill the pressure via the filling loop, but the pressure drops after about 5-10 mins, this only started today, this morning.

 

[ShaunCorbs]

I can refill the pressure via the filling loop, but the pressure drops after about 5-10 mins, this only started today, this morning.

Is anything dripping outside when you top it up ?