Click click click click click cliclk

[Sid Viscous]

Hi guys, been to see a Main Combi 30HE today that won't fire up. I've not come across this problem before. When powered up & call for heat, the fan starts, aps makes, pump starts then dhw led flashes accompanied by a repeated click click click as the hydraulic differential pressure pin & switch kicks in & out constantly. That's as far as it goes. Checked the switch is making & breaking electrically, seems fine. Dhw priority pin & switch doing what they should. I'm told it had the diverter replaced in the last year but was working fine. Ideas welcome please

 

[Sid Viscous]

Got y'all on this one, have I? :clap:

 

[lame plumber]

any sparking? any gas at burner

 

[Sid Viscous]

No dude, nothing past diff switch pulsing

 

[Billy Bob Bob]

working on heating?

 

[Sid Viscous]

nope!

 

[REDSAW]

its the diverter solonoid
take it off, push a bolt down on the pin in the diverter valve to check all else works.
then check the pin on the solonoid comes in and out.

 

[Billy Bob Bob]

30 he as in band b baxi 105 he with a different badge?

 

[Sid Viscous]

I believe so Gas Man. Redsaw - just checked mi's, I couldn't find any ref to a diverter solenoid

 

[Billy Bob Bob]

hurry up with your replies sid or i will get board

 

[Billy Bob Bob]

I believe so Gas Man. Redsaw - just checked mi's, I couldn't find any ref to a diverter solenoid

does not have one martins thinking of a band a,now with a insulated screwdriver or apprentice you held up the rear microswitch what happens then?

 

[Sid Viscous]

Didn't get that far, was getting late & I was starving! Custards on their jollies for a week but I'm going back at some point in the week, got a neighbour to let me in, I'll have a bit more time to play with it then

 

[lame plumber]

he's on his way to the custard to see

 

[Billy Bob Bob]

Didn't get that far, was getting late & I was starving! Custards on their jollies for a week but I'm going back at some point in the week, got a neighbour to let me in, I'll have a bit more time to play with it then

ok its important you check this if it runs the small diaphragm is split,pins sticking, or orifice under its blocked,if t does not run i would be looking for water ingress into the pcb especially if a dv has been changed the dhw light should not be flashing at all

 

[Billy Bob Bob]

this will help slightly but not much:smiley2: same boiler
Baxi Combi 105HE Installation & Service Instructions

 

[lame plumber]

i hate it when he chats like this, I have to be sitting there to work my way through fault finding, still he's quite good even if his taste in car colours isnt

 

[Sid Viscous]

Pin's not stuck, as I said in op, it's up & down like a drunken fiddler's elbow! Checked pcb ( it's the easiest place to electrically check the aps! ) dry as dust. So we're down to orifice or blockage then? Advance warning Gas Man - I'm off out back for a burn & to pour another tinny, back in about 6mins! :smiley2:

 

[Billy Bob Bob]

Pin's not stuck, as I said in op, it's up & down like a drunken fiddler's elbow! Checked pcb ( it's the easiest place to electrically check the aps! ) dry as dust. So we're down to orifice or blockage then? Advance warning Gas Man - I'm off out back for a burn & to pour another tinny, back in about 6mins! :smiley2:

lifting the microswitch will rule out the small flowswitch,a dry pcb does not mean it did not get wet when the dv was changed and now corrosion's set in,what you try next will depend on what direction the faults going,but i dont like the dhw tap flashing this is not a instant is it?

 

[Billy Bob Bob]

i hate it when he chats like this, I have to be sitting there to work my way through fault finding, still he's quite good even if his taste in car colours isnt

thats a sore point,wifeys burnt the clutch out,mechanic has confirmed the slave cylinders melted,only thing that causes that is riding the clutch

 

[lame plumber]

not cheap, at least 2 boiler swaps

 

[Billy Bob Bob]

not cheap, at least 2 boiler swaps

300 quid all in

 

[lame plumber]

2 robo expn vessel replacements then

 

[Billy Bob Bob]

2 robo expn vessel replacements then

she has to pay half,tough lesson,next time she pays in full