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Updated 07 September 2017   Lovekin Ltd 2009-2017    registered in England & Wales No.3950749    Little Courshay  EX13 5XF

Link to Central Heating Problems and Gas Boiler Problems home page

heating and boiler problems  –  lovekin.net

General System and Boiler Problems and Fault Finding

British Gas BGMVSP-2 two port valve

Boiler fired up when there was no demand from the programmer, sometimes in the middle of the night


Expansion vessel problems – sealed system pressure problems

Big changes in central heating system pressure? or combi boiler pressure dropping? Faulty expansion vessel in a system boiler?


Frozen condensate pipe? E133, EA, D5 error or fault codes

Frozen condensate pipes are causing problems in another cold winter


Grundfos 15.50 circulating pump and Grundfos 15.60 high head pump

This is not a pump fault but bad installation


Grundfos 15.50 circulating pump failure

Customer reported system blowing fuses


Honeywell V4043H motorised zone valve (2 port valve)

Boiler stays on (permanent demand) even when programmer is switched off and room stat turned down


Honeywell V4043H motorised zone valve (2 port valve)

Customer reported that water would not heat unless central heating was on too


Honeywell V4073A mid-position motorised valve (3 port valve)

Customer reported hot water OK but no central heating


Honeywell V4073A mid-position motorised valve (3 port valve)

Customer reported radiators getting hot when only hot water was selected


Pressure relief safety valve letting by

There was a steady, rapid drip of water into the tun dish beside the unvented hot water cylinder


Radiator balancing – balancing radiators

Balancing radiators is simple, it just takes a little time. There are more complicated methods but this method works fine for us


Radiator valves – wheelhead valves, lockshield valves and thermostatic radiator valves (TRVs)

We have a section on how to  balance radiators.  Older valves will often leak when you try to balance radiators and the valve may require changing