Question about Desa International CBN30T Central Heating System Heater

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I have a fault with my halstead platinum boiler no Hw/CH

I have got a fault on my halstead platinum boiler when i switch it on there is no red fault light and the boiler sounds like there is alot happening however no hot water or central heating.
however i have noticed that the fan runs some times for a short time then seems to slow down as if there is a slow loss in power.
I have removed the fan cleaned it up and it is very free to turn.
i have tested the Differental switch operation as i thought that if it was that the fan was not creating the vacume.
i am at the moment assuming that it is a fault on the pcb with a bad contact on the relays.
Can anyone help please?

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Posted on Jan 02, 2017

  • 139 Answers

SOURCE: My vent free Desa natural log will run for a short

it is likely you have dirty O2sensor, it is incorporated into pilot assembly.turn unit off,use compressed air in a can and blow into spot where pilot flames comes from.this will fix it in most a small % of time entire pilot assembly needs to be taken apart and cleaned

Posted on Jun 25, 2009

  • 33 Answers

SOURCE: no heating but still get hot water

Sounds like 3 port valve fault

Posted on Jan 17, 2010

  • 3182 Answers

SOURCE: Central Heating\which combi boiler?

HI right first i would look at a worcester greenstar combl
best you can get and you have full back up from worcester leave all rads with stats as they are i think you will have to remove one , the that would be the bath room also the greenstar comes with a clock bulit in these are on the worcester bosch web site i have been a gas fitter fot 30 years and this what i would go with a really good combi, you can also get awire less room thermostat for this hope this helps

Posted on Feb 01, 2010

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  • 3182 Answers

SOURCE: My new heating system is

okay could be a slight blockage in the pipe did he do a hot and cold flush on the system ? pump speed could be too high or low or they could be air lock in the system ,

Posted on Sep 04, 2010

  • 3182 Answers

SOURCE: my Worcester 24I combi boiler not working - I have

look on the worcester wed site you can down load amanual for this with a fault chart in it , look for a button red?? could be the res et poped out 2bar is too high should be 1.5bar hope this helps

Posted on Sep 26, 2010

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you can check this switch to see if the boiler works by removing one of the sensing tubes from it & by sucking on or blowing as this willactivate the switch you dont have to do it very hard, just gently as you will hear the switch clicking, if the boiler does fire when you click, in order for it to continue to ignite you may have to fold over the tube, when you release it the boiler should stop.if it does work then you will have to change the air pressure switch, but remember this can only be done by a Corgi Engineer



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