halstead quattro combi

[CLARKO]

i have installed a new diverter valve to my wickes 2000 boiler aka halstead quattro due to having no hot water. the boiler will now not fire for c/h or h/w . if i open the hot tap the d/v works as it should the pump runs nothing else after that. the boiler is pressurized to 1.2 bar. before i changed the d/v the c/h worked fine. i do not have the manual. i suspect it could be the flow switch but i can not see it any advice would be grateful

 

[weargas]

as i remember your boiler doesn't have a flow switch (i could be wrong). The next in the sequence should be the fan.

 

[kevplumb]

if it hasnt got a flow switch what tells it to fire or do you mean a micro on d/v ?

 

[CLARKO]

weargas thanks for the reply with you saying there is no flow switch should i have 240 v at the fan, why do you think it worked for c/h before and not now. thanks

 

[ratonnastick]

The basic operation sequence of this boiler is, call for heat ,fan starts, pump starts, diverter directs water flow, air pressure switch senses air flow , gas valve opens,if after 10 secs if no flame green neon goes out.
at what point does it stop?

 

[CLARKO]

call for heat run a tap, fan not spinning pump working d/v switches correctly nothing else

 

[weargas]

i mean there is no primary flow switch (switch operated by pump running). The fan and pump are energised at the same time. If the fan fails the aps stops ignition. If the pump fails the boiler will simply overheat (not a great set up)

 

[kevplumb]

check the power to the fan

 

[weargas]

call for heat run a tap, fan not spinning pump working d/v switches correctly nothing else

try to be a little more vague.

 

[ratonnastick]

haveyou found the over heat cut out reset switch ?

 

[CLARKO]

kevplumb ive only got a neon screwdriver at the mo when held on the fan connections it showed no power at the fan but neons can be a bit crap

 

[ratonnastick]

The basic operation sequence of this boiler is, call for heat ,fan starts, pump starts, diverter directs water flow, air pressure switch senses air flow , gas valve opens,if after 10 secs if no flame green neon goes out.
at what point does it stop?

if the fan fails to start first check over heat cut off reset (this can be faulty) if there is 240 at the fan then you need to check the overrun stat wiring

 

[CLARKO]

were is the overheat rest switch

 

[ratonnastick]

as far as i can tell on the underside its about 2" across with a little push swith in the middle (might be hidden by case)

 

[kevplumb]

ratonnastick have you developed a lisp