worcestor bosch 24i junior HELP PLEASE


Postby bittybunny » Sat Jun 05, 2010 6:44 pm

Hi guys bosch 24i junior,model before greenstar,turned on call for heat or hot water fan will not fire up,blow down tube on air pressure switch ,fires up straight away,am i right in thinking that on this model the air pressure switch must be in closed position at rest to start ignition sequence,thanks rob
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Postby htg engineer » Sun Jun 06, 2010 1:28 pm

Fan running ? operating the air pressure switch makes the boiler come on - this is what the fan should do.

If the fan isn't running is there power to the fan ? if yes - replace fan.


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Postby bittybunny » Mon Jun 07, 2010 4:21 pm

[quote="htg engineer"]Fan running ? operating the air pressure switch makes the boiler come on - this is what the fan should do.

If the fan isn't running is there power to the fan ? if yes - replace fan.


htg[/quote] hi htg no fan does not run,when boiler turned on there is no power to the fan and eventually goes to fault flashing 4 times a second,if i reset it and blow into aps fan starts straight away,there is no power to the fan when boiler first turned on and when i manually start it by blowing aps there is only 180 volts ac to it has the pcb had it?
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Postby htg engineer » Mon Jun 07, 2010 8:05 pm

If there's definitely no power to the fan, then yes could be PCB fault.

However there wont be power to the fan as soon as you turn the power on, there'll be a sequence. Is the fan motor warm ?


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Postby bittybunny » Tue Jun 08, 2010 2:51 am

[quote="htg engineer"]If there's definitely no power to the fan, then yes could be PCB fault.

However there wont be power to the fan as soon as you turn the power on, there'll be a sequence. Is the fan motor warm ?

hi htg engineer sequence starts with pump,fan motor not warm ,no power going to it,just before boiler goes to flashing fault light board relay clicks and fan spins momentarily
bittybunny
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Postby eggers » Mon Jul 05, 2010 9:27 pm

have you checked the water pressure switch, they do block up and do cut power to either the pcb or fan i can't remember right now
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