Bingo. After finding out about the difference in models ie. flow switch/pressure switch finally i have found the fault.
Initially i looked at the installation manual followed instructions for low pressure-code 04-
I then found pressure ok
Checked what i thought at the time was the pressure switch.Found the pin slightly sticky in the diaphram/manifold housing,so cleaned and rebuilt this.
Found system still tripping.Then eventually would not reset at all,showing code 04 constantly.
I then followed pcb reset fault finding flow chart and came up with the conclusion that the pcb may be at fault.
Replaced pcb that i purchased on ebay for a reasonable price of 40 quid!
Found system now resetting as it should but fault still happening.
Due to pump being so quiet i could not tell if it was pumping or not when covers on,but when i learned about the differences between old model and new.Realised that the pump on my system is what activates the flow switch/pressure differential switch and infact it does not have the usual type pressure switch.
I then found which plug on the pcb supplied the motor and monitored voltage with multimeter til fault happened/tripped fault 04.
Bingo!!! Board supplying pump 240v,led flashing 04,flow switch not pressed and that F***ING pump sticking!!!!!!!!!!!!!
I was thinking that the original pcb may be ok,on the other hand i was also thinking that if the pump is tight it may have damaged the board because a tight pump will draw far more current!
I will get a new pump in the morning and fit in the evening after work and keep the thred updated. Fingers crossed.
Not bad work for a motor mechanic me thinks
