potterton promax he store

[plumb_know]

Hi Everyone,

I am going to a promax he store which i serviced a few weeks back due to loud noise when heating was on. i cleaned burner replacing burner door seal & flue sensor.

on the 1st visit the boiler was running fine until it modulated to low rate, the flame was not regulating properly, cutting off & on banging. the flue htc resistance was not right so we replaced this and all seemed fine on commissioning.

now the customer is saying she turned the heating on to dry some clothes and boiler is louder than before.

when i go there i will be checking working pressure etc again just wondered if anyone has experience with these and knows of common faults i could be checking for??

Thanks in advance

 

[Harvest Fields]

I have one in my house. The diverter can bang and knock sometimes which can be annoying. But other then that I haven’t had any issues really.

 

[plumb_know]

Thanks harvest,

Called potterton and they said most likely gas valve picked one up but seemed calibration was way out tried adjusting it but wasn’t getting anywhere fast. Going back this evening with another new one, will let you know how it goes

 

[plumb_know]

Here now and was not faulty gas valve, new one is doing the same.

It I put it in max test mode and co2 goes sky high and reaches max temp in about 30secs so haven’t got long enough to adjust gas valve. Then in min as it regulates down get vidating and flame lifting.

Getting 20mbar operation pressure, cleaned burner, replaced flue htc & burner door seal on last visit.

Anyone got any ideas?

 

[plumb_know]

* vibrating

 

[Harvest Fields]

Fan?

 

[plumb_know]

yeah maybe, is there any way to check the fan is operating at the correct speed? It looks/sounds like it is operating ok.

i will call baxi tomorrow again and see what they say.

 

[ShaunCorbs]

Burner clean etc

Was the test done with the cover on or off

 

[plumb_know]

Hi Shaun,

Yes i cleaned out the burner previously, the burner is sealed but i also had the internal boiler casing on when doing the test.

I have replaced flue sensor & replaced burner door gasket seal.

appreciate the help