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Discuss Worcester Negative Fan Pressure decrease after cleaning heat exchanger in the Gas Engineers Forum area at PlumbersForums.net

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Hi, I am new gas safe registered. I serviced a old worcester R28 HE Z7-28 system Boiler. found negative fan pressure -3.95mb lower than MI's -4.2mb, Gas rate is 2.82 m3/h, little bit lower than MI'S 2.9M3/H, so clean heat exchanger very well. after that check fan negative pressure, -3.11mb, later check again-3.22mb working through 10minutes at Max Rate. Gas rate 2.61m3/h, just same as -10% of 2.9m3/h. Curiously, I check the heat exchanger again, totally clean, and wash through by 4 litre water, it is totally clean, never see any heat exchanger clean then this. I don't know why the pressure is lower after cleaning heat exchanger. Cheers
 

Allgoode

Gas Engineer
might be a weak fan taking into account boiler age & or check connections as through ageing can have leakage thus giving you issues.
Thats the problem with older boilers, wear & tear, if rest of readings check out then you will be fine,
cheers,
Andy
 
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might be a weak fan taking into account boiler age & or check connections as through ageing can have leakage thus giving you issues.
Thats the problem with older boilers, wear & tear, if rest of readings check out then you will be fine,
cheers,
Andy
Man thanks Andy hope that explains
 

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