Worcester Bosch 35kw condensing combi A1

[marc8]

Hello all

as above approx 10 yrs old electronic version, showing A1, pump run dry, which is running & also pumping round rads & hot water, sometimes last's for hours sometimes minutes,
if I can get it through symphony fill.
Get hot water & heating, I am thinking a sensor any ideas would be welcome?
greenstar

 

[Corbs]

whats your system pressure like ? about 1.2 bar when cold and do you get any cold spots on your rads? and when was it last serviced

 

[marc8]

Hi there
bled system, had service just over year ago when I had to replace ignition probes, also cup & flaps for air mixture must admit had not touched since installed. Good pressure

 

[Corbs]

Hi there
bled system, had service just over year ago when I had to replace ignition probes, also cup & flaps for air mixture must admit had not touched since installed. Good pressure

do you know if the pump has been changed in the last 10 years? and when the pump is working any noise/ bad vibration on the pump?

 

[marc8]

Pump is fine no noise no vibration, runs H/w & C/H ok

 

[Corbs]

i would say the pump was on its way out but with out seeing and testing the boiler i cant give you a defo answer sorry

 

[marc8]

i would say the pump was on its way out but with out seeing and testing the boiler i cant give you a defo answer sorry

pump running fine is there a sensor in the pump then on this model?

 

[Corbs]

pump running fine is there a sensor in the pump then on this model?

can you give me the boiler model please/ a pic and no senor on the pump the error code refers to pump run dry or seized/ not full speed pump speed

 

[marc8]

Hi corbs

is is there anything I could check? I am a qualified electrician & this is my own boiler not a customers , that why i am asking if there is a sensor to check & if so what resistance would this be in ohms.

 

[marc8]

Sure will get model number

 

[marc8]

Model 11-35kw ZWBR he plus green star
GC number 47-311-57
order number 7 713 231 775

 

[marc8]

Picture of boiler sorry should have turned it round

 

[Corbs]

that helps a lot i can give you this number then, they will be able to tell you the resistance levels/ohms

0330 123 3366

any problems just report back but i suspect as there are now flow sensors on the heating side other than temp sensors the pump is on the way out

 

[marc8]

Hi corbs
many thanks I will call them in morning thanks for help

 

[Corbs]

np let us know how you get on

 

[UNG]

Do you have these manuals they may help your troubleshooting

Installation and service manual

http://www.google.co.uk/url?sa=t&rc...=ACKgrxekSJzdYT9NxBUzZw&bvm=bv.68445247,d.ZWU

Service booklet for engineers

http://www.google.co.uk/url?sa=t&rc...=DxBzNISUrx-3xkuQlDMK_g&bvm=bv.68445247,d.ZWU

 

[marc8]

Hello all thanks for help
spoke with bosch done the 7:3 boiler purge air, but as mentioned by bosch that when you restart the boiler the boiler purges automatically.
But looks like new pump

 

[Corbs]

did you get through ok?

you can do a simple test if you want but bea warned it may spit it back out/break your screw driver lol

open the air/bleed screw on the pump and have an old flat head screw driver to hand

slowly put your screw driver in the pump via the vent hole and slowly apply pressure if you can stop the pump your pump is **/* if it spits your screw driver out then your pumps fine

(note i dont do a+e phone calls with screwdrivers in people hands so i dont accept responsibility if it goes wrong )

 

[Geordie Spark]

View attachment 25050Picture of boiler sorry should have turned it round

Aye .... I would say you've just found the problem - it's not designed to work on its side!!

 

[Corbs]

Aye .... I would say you've just found the problem - it's not designed to work on its side!!

dont know who installed it then