I have serviced my 135OCB for five years now and generally get better results than when I paid for AGA engineers service (says my wife!).
A few years back, the thermostat seemed to change when I noticed it only clicked around the 1-mark. After valiant (and valium) attempts to correct this problem, I altered the high fire/low fire screws plus the flexatemp to get the desired results. Thus far, everything has been OK.
I now realise I ought to fix (or replace the thermostat if it is faulty?); also correctly reset the flexatemp (or replace if faulty); and reset the high/low fire screws as necessary.
To start with, I measured the high fire oil flow ( first by lifting the flexatemp manual lever to high fire) into a tube and measuring glass at the oil feed pipe rising into the burner section. This measured between 5cc and 6cc. No matter how I adjusted the high fire screw I could not get the output to the required 8cc.
I have checked and cleaned the oil tank filter, the control valve filter, decoked the burner, checked for levels etc. The low fire oil flow seemed OK at around 4cc.
I have relit the AGA and with further teasing of the high fire screw have managed to get the temperature just under the black line (which is my preferred normal setting) for our house of two adults minus the kids.
I have some OCI literature for the 240VNT control valve and flexatemp 3513 but would appreciate some advice how to reset the flexatemp and also any advice how I should open up and check the oil level or other operational parts of the control valve.
Any sugestions graciously received.