Had one very similar last year, did all of what gas man has suggested. Boiler still only working when casing cracked open.
Went through technical who suggested hard resetting the PCB and setting up again with correct according to rating of boiler. Worked miraculously first time. No issues since.
Thanks guys, im back there on Monday so will check dhex and diaghpram.
@jtsplumbing. Yes it's a hard water area.
Now re dhex and split diaghpram. Dhex isn't in play is it if CH is called for. Unless div is stuck and trying to push through dhex.
And the diaghpram, suppose could be a...
Wonder if I could have some pointers with this boiler.
Flow switch is not being pushed out, with pump running. Pump rotation is strong (checked through the bleed screw), also taken out to check impeller which is securely attached.
When switch manually activated boiler kettles.
When flow...
Thanks again to gas man for venturi part number.
Dhw diff pin was seized on the rear exit. Which I should have bloomin cleaned and greased when doing the diaphragm.
Thanks all.
Fantastic, thanks gas man. That's the part, I found the cross end bit and spring by return port at plate HEX.
Local merchants told me it only came as part of the whole block!
I'm just hoping that changing this will sort out the slow movement of dhw pressure diff valve?
Hi guys,
I have been working on this potterton today, dhw pin was sluggish and diverter was passing through to CH on DHW demand. Changed diaghpram on DHW, and three was diverter block.
Whilst off, also decided to put some chemicals through the plate HEX. Where I found broken bits of flow...
Bit more info.
Before dhex change, Dom water was cycle Luke warm / cold.
After new dhex, now constant Luke warm.
Pump is working, circulating CH three floors up without issue.
I think phex is not performing, now that dhex is passing through fine. Phex can't keep up with flow of water...
Help me please guys.
Diagnosed this boiler as blocked dhex, changed but still same problem.
Water runs like warm, boiler Temp shows 45 even though control on Max.
When demand is turned off, it jumps to 70 before pump switches off.
Tried reducing cold water pressure onto boiler, still...
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