Remeha Avanta 35C No Pressure On Gauge

I was servicing a Remeha Avanta 35C combination boiler today and the first thing I noticed was that there was no pressure in the boiler and heating system according to the pressure gauge on the front of the boiler. I opened up the taps on the filling loop to put water in the system and increase the pressure. Still there was no movement on the gauge so I stopped filling with water as I did not want to over pressurise the boiler.

I have seen this problem before on these boilers and so am always wary of believing what the pressure gauge says. I grabbed a bucket out of my van and a couple of manometer hoses and attached these to the drain plugs on the flow and return of the boiler. I drained the boiler through these drain plugs. Using a spanner I undid the gauge connection at the boiler and removed it from the boiler. The hole for the water that activates the pressure gauge is tiny and can only be unblocked with a fine pin. I unblocked the hole and re-assembled the boiler. Opening the filling loop I could see that the water pressure was rising and that the gauge was showing the correct reading again.

Disclaimer: The works described in this blog are a record of work undertaken and should not be taken as guaranteed to solve your problem. Work should only be carried out by persons qualified and competent to do so.