|
Post by qwerty on Apr 9, 2013 16:44:43 GMT -5
i have a powermax 155 which "keeps tripping". After resetting it can run for a day or so with no issues,then it will trip again. i have been told the cause of this is because the plate heat exchanger is scaled.so can a scaled plate h/ex. cause this boiler to trip.
|
|
|
Post by qwerty on Apr 9, 2013 16:45:17 GMT -5
i have a powermax 155 which "keeps tripping". After resetting it can run for a day or so with no issues,then it will trip again. i have been told the cause of this is because the plate heat exchanger is scaled.so can a scaled plate h/ex. cause this boiler to trip.
|
|
|
Post by Mike the Boilerman on Apr 13, 2013 9:38:31 GMT -5
No it can't.
What do you mean by 'tripping', exactly? What to you do to re-set it?
Mike
|
|
|
Post by aa on Apr 13, 2013 12:59:03 GMT -5
THE OVERHEAT STAT. ON THE TOP LEFT HAND SIDE NEEDS TO BE RESET,THE BOILER THEN FIRES UP. COULD THIS FAULT BE THE RELAY THAT YOU VE REFERRED TO IN PREVIOUS POSTS.
|
|
|
Post by Mike the Boilerman on Apr 18, 2013 6:09:00 GMT -5
Yes, this is a hold-off relay failed.
I'm wondering why you typed in such a large font!
Mike
|
|
|
Post by Gina on Apr 3, 2014 5:05:31 GMT -5
Hi Mike,
I am hoping you can help me in confirming the root cause of my boiler the Powermax 155. A bit of background on this boiler. It was installed when the flat was built in 2000 so we are looking at a 12/13 year old boiler. I must say it is working just fine, the only issue I am facing is the hot water. According to your site this is the symptoms we are facing:
2) Hot water runs hot initially then cools down. Most commonly caused by a failed thermostatic blender valve. A new valve fixes the problem. Less commonly the cause can be water scale. If the Powermax has an external plate heat exchanger this can be replaced quite easily and hot water is immediately restored. Many Powermax boilers have an internal domestic water heat exchanger and chemical descaling will be necessary. Not especially difficult but time-consuming and invasive. Involves bringing chemicals, a descaling pump, hoses etc into your house.
I had a plumber come by and it would seem the thermostatic blender valve is fine. There is no leak on or around the valve. One of the pipes is cold (assume its the water coming in from the mains?), the 2nd pipe is warm (boarder line hot) and the 3rd is also the same as the 2nd. I assume the last 2 pipes is the hot water running to the flat?
We do get piping hot water in the kitchen and in the 2nd shower and the plumber said this is because we have a thermostatic mixer shower where as in the bath tub which we have a mixer shower it is here where we can see the difference. He mentioned it is because of the cold water flow, in that it is so powerful that the heat exchanger doesn't have enough time to heat the water up due to the scale built on/around it. He suggested we de-scale/flush the system out in the HW side (he suggested for CH as well but this is working just fine - its too hot! So we don't need this touched). He would be adding an inebriator liquid.
I guess my question is if this will resolve the hot water turning luk-warm by carrying out a power flush? Or would the heat exchanger need replacing? In which case this would lead to my question on can the heat exchanger be replaced for a Powermax 155? Note that the heat exchanger is internal.
An alternative approach I believe would be to change the standard bath mixer taps and replace this with a thermostatic mixer tap. I assume this would then enable me to have hot water constantly?
If the heat exchanger was faulty and/or scaled up would this affect the central heating in that the radiators would perform OK and not piping hot?
Your answers would be much appreciated!
|
|
|
Post by luke3917 on Apr 18, 2014 6:16:59 GMT -5
Hello Gina. I 've got the same problem. I 've thought and read about power flushing my HW system works. Please post your results here. Plenty of folks in same predicament
Luke
|
|