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Hi, I have a WB Greenstar 25SI combi boiler, its about 10 years old, not been serviced.
Recently (well over the past year) DHW in the bathroom goes cold quickly.
We get a burst of hot then it quickly goes luke warm to touch.
That is the taps, the bath and shower.
Flow seems to be nice & strong (Ill try a flow test when I get a chance).
The kitchen taps however seem to be fine.
The boiler seems to indicate that the flame is on OK at all times so its not the gas/flame going out.
Im thinking (after some searching) that its most likely the DHW heat exchanger is clagged up or the diverter valve.
On a previous WB boiler (now well obsolete) the diverter valve was easily fixed using a generic diaphragm repair kit but for this plastic thing in the 25si is that even possible or is that only a replaced the whole part job?
Re the heatx, I can see that it is a bugger of a job to remove but a dose of spirit of salts and some flushing through may clean it.
Before I see the gas guys at work can you suggest anything else that needs checking?
Recently (well over the past year) DHW in the bathroom goes cold quickly.
We get a burst of hot then it quickly goes luke warm to touch.
That is the taps, the bath and shower.
Flow seems to be nice & strong (Ill try a flow test when I get a chance).
The kitchen taps however seem to be fine.
The boiler seems to indicate that the flame is on OK at all times so its not the gas/flame going out.
Im thinking (after some searching) that its most likely the DHW heat exchanger is clagged up or the diverter valve.
On a previous WB boiler (now well obsolete) the diverter valve was easily fixed using a generic diaphragm repair kit but for this plastic thing in the 25si is that even possible or is that only a replaced the whole part job?
Re the heatx, I can see that it is a bugger of a job to remove but a dose of spirit of salts and some flushing through may clean it.
Before I see the gas guys at work can you suggest anything else that needs checking?