PRESSURE GAUGE FLUCTUATION

[uselessgit]

My pressure gauge needle is wobbling up and down while dhw is running. Is this normal?

 

[Gasguru]

Its common for the pressure gauge to move slighly up or down under DHW demand (direction is dependant on which side of the pump its connected to).

A lot of movement under hot water demand could indicate a partial heat exchanger blockage.

A rapid fluctuation of the needle may indicate traped air in the heat exchanger, slow circulation or water boiling.

 

[corgiman]

what boiler is it

isars are buggers for this?

 

[uselessgit]

ITS A IDEAL SPRINT RAPIDE RS75N. IT SITS AT ABOUT 1.5 BAR AND JUST WOBBLES UP AND DOWN WHILE DHW IS RUNNING. SORRY FOR CAPS!!

 

[Gasguru]

This is a very old combi - you may have air in the domestic heat exchanger (round cylinder type I think from memory). There is a bleed point on the top.

Is the presure ok ie 0.5 to 1.5 Bar cold?

How much is the gauge moving?

 

[corgiman]

dont worry about it.

see the first answer