Worcester 28cdi

[Hobo128]

Called out to a worcester 28cdi ( not greenstar, old one with grey front) making a strange noise, little bit of banging etc. I think it's the pump, turns out that the pump only works on speed 3 and if you turn it to speed 2 or 1 it stops and obviously starts banging loads.
Obviously there is a problem here but is it the pump thats at fault or could it be the pcb not sending thd right voltage to gh ed pump?????

 

[ShaunCorbs]

if you can change the speed on the pump then its the pump, you can test the feed (power), i would say its the pump

 

[gassafe]

Could be pump, might be all sludged up heat exchanger that would cause banging too as its getting old!

 

[Hobo128]

if you can change the speed on the pump then its the pump, you can test the feed (power), i would say its the pump

Do you mean " if you CAN'T change the speed on the pump"
I'm getting resistance on all speeds on the pump, seem a little high though.

 

[ShaunCorbs]

Do you mean " if you CAN'T change the speed on the pump"
I'm getting resistance on all speeds on the pump, seem a little high though.

Yes sorry and some on the very old ones had a selector on the side of the pump (where the elec connections are) 1 - 2 - 3