Istor H5 code

[Jellydealx]

Hi

I have an ideal standard istor He . It needs servicing due to a loud bang and rattle that happens when the burners have been on a while. Now though- may be connected, it's showing H5 for the error code. This can be cleared by turning it offf for a while.
H5 is : jumper links not inserted to control board. I have had a look but can't see any thing loose or unplugged. Does anyone know where these jumpers are?

Thanks
Baz

 

[gas4you]

Top right hand corner of the pcb as you look at it in your hand.

They could have worked loose a bit. I've had this very same thing before as well.

 

[shambolic]

Try turning tap on for 10 mins when heating is on. If it bangs and rattles during the changeover from heat to hw this is the coils in the cylinder rattling as motorised valve changes as pump on return pushes ball back against valve internally.
H5 is defo jumper links in wrong position but could be faulty pcb or user control nought to do with noise

 

[hect]

H5 points to jumper issue, I suppose its easy for people with big hands like me to think they are in position whereas they infact are not!!