Powermax 155x

[GrahamR1]

Hello

Desperately looking for an engineer who specialises in Powermax boilers to come and fix ours in Dundee!! It is seemingly randomly locking out. We have had about ten visits from local companies and through a repair contract with Baxi Heat Team but all the engineers so far have been replacing the thermostats and cutouts as per the manual but it has made no difference. Web pages seem to suggest ignition electrode, ignition cable, gas valve, control board or heat exchanger might be at fault but not sure that anyone will look at these unless they have a lot of experience with this boiler. If you work for Baxi Heat Team and think that you might be able to help, let me know and I'll contact Baxi Heat Team to see if you can come the next time.

 

[mickyg]

if the manufacturer can't fix it, that doesn't leave much help for anyone else! If your having numerous visits by them then its time to start making some noise, then hopefully they'll send a senior engineer out who'll have a bit more time to properly diagnose the problem

 

[dfaz]

we deal with powermax but unfortunately are nowhere near,a common fault is incorect setting of the gas pressures they are odd to set up.the pressure is set up as a differential between the gas valve and fan at
minus 0.13 millibar( powermax 155x) .then the gas pressure should be checked afterwards at the pressure test point the pressure should be within manufacturers parameters outside of these can indicate blockages in either sump or flue. this is very critical and should not be attempted unless you know what you are doing.incorect setting of the gas valve produces huge quantities of carbon monoxide (as the two lads from bg who are up for manslaughter charges will testify)I suggest you get a good engineer in make sure you have got the correct instructions for that particular model because they differ from model to model tell him also to check the flue long runs of pipe collect water and can corode the pipe if the burner is to be removed a new burner gasket will be required.Im sure there must be some good engineers local to yourselfe and as long as you have the instructions he will be able to do the job.have you tried the gas safe website?

 

[Vic Spanner]

Electrode is fooked ..Probally....Sad that Heateam Engineers have not removed the burner and carried out a couple of tests to check electrode and lead...

 

[shawd]

Random lockout,,,,,
First replace gas valve,then pcb, then check turbulators ,,then electrodes,,intermittant lockout could be either one or more than one thing, depending what work you have had done before,, do not do it yourself and always change burner gasket..Get heateam back , have the insurance

 

[mickyg]

Random lockout,,,,,
First replace gas valve,then pcb, then check turbulators ,,then electrodes,

in that order? Blimey a call out for you must require some budget!

 

[shawd]

sometimes insurance pays to have it,

 

[rojaca]

Well what's it doing when it's locking out. Does it fire up get hot and lockout? Doest it heat one cycle but then wont relight on second? Does it try to ignite but no flame? Does it seem to ignite then stutter after a couple of seconds?
Intermittent faults are a nightmare so the more information that you can gather the better. Both for us and the poor unfortunate that next attends.

 

[rojaca]

"a common fault is incorect setting of the gas pressures they are odd to set up.the pressure is set up as a differential between the gas valve and fan at
minus 0.13 millibar( powermax 155x) .then the gas pressure should be checked afterwards at the pressure test point"

A good point but I would suggest that you want to be checking the burner pressure test point prior to attempting to adjust the neg diff' and checking the figures are within the range specified (4.8-5something or other?). If there is any blockage you want to identify this before setting the air gas ratio- well I would anyway.

As you rightly point out . It was failure to set the valve up correctly that led to the unfortunate incident-NOT THE BOILER!

I hope that the above quotes etc emphasise the point about how dangerous undertaking DIY gas work can be.