the pressuer had droped in my boiler, bleed raitaors,pressure put back up, now the pressure keep rising and falling slightly when running hot tap, burner also comes on and cut off for a few minitues before coming back on again ,please can you help?
Sure can....expect the pressure to increase a few psi when the heating is running - this is normal. Keep the pressure at 1.5 bar - best set cold. If the pressure fluctuates, the expansion vessel needs recharging. If the pressure drops, look at the overflow pipe outside. If its been dripping, have the pressure release valve replaced (£10 part). If the pressure is still falling, have the automatic air vent (AAV) replaced. (£8 part).
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