Falling combi pressure?

28 Jun 2004
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United Kingdom
Bled two of my rads last week, ever since the pressure gauge keeps falling to the left (low pressure). I've got a Baxi 133 HE Condensing Combi, the gauge is marked in three parts: 0-1 (Red, low pressure, possible leak), 1-2.5 (Green, normal pressure, OK), 2.5-3.0+ (Red, high pressure, problem). Its one year old and there hasn't been any problems.

Once all the rads are hot the thermostat turns the boiler off and the pressure needle slowly falls to the left towards zero. Then when the thermostats kicks off again the boiler comes on and the needle moves tto its ideal position at 12 O'clock (at about 1.5). I've checked the rads and there are no leaks, as far as I can tell. The system works fine, but why does it keep back?
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you need to repressurise...have a look at the faq on this forum or read ur user intructions for the boiler

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