Hi Davina
Not something you should try yourself. It sounds as though there is insufficient gas pressure getting to the appliance. Have the gas supply and the unit checked by qualified engineer.
You have more or less answered your own question in that if the existing btu output from the 3 rads is sufficient to heat the room then, 1 large radiator of the same output will do the same job.
If there are thermostatic radiator valves fitted the, direction of the water flow can influence the valves. Should the flow direction not suit the valve install then the valves may click (or as you say pop) when the thermostatic valve head attmpts to close the valve. Worth having this checked.
When you recharge the system to around 1.25 Bar cold, does the pressure hold. If it does then monitor the operating pressure as the system starts to heat. It should rise by approx 0.5-0.75 Bar during operation. If the pressure rises to around 3.0 Bar then water will be discharged via the PR valve an...
Worth draining both rads individually into a tray or something similar. Onced drained disconnect and check both the flow and return valves are live by slightly opening them running water from each into a catchement untill the water runs hot. This will prove there are no air-locks or blockages Chance...
The arrow on the pump is indicating the rotation direction of the pump. To vent the pump one full turn anti-clockwise should be sufficient. Be patient and wait till all air is dispelled and only water is seen. Better doing this when pump is not running. In the event of the screw coming out there sho...
Hi Pete Your radiators need balanced. This is achieved by contolling the flow through each radiator by adjusting the lockshield valves. That is the valve on the opposite end from the rad from the control valve. The radiator nearest the boiler should have its valve slightly open, enough to allow suff...
Not a major expense to have the RF temperature control disconnected from the boiler control to prove boiler is functioning normally. If the boiler does operate OK the you are looking at replacing the RF controller.
Your boiler should operate between 1-2Bar from cold to hot. When it reaches 3Bar there is a problem. Firstly check the cold fill valve is properly closed and not allowing the mains pressure to pass into the system. Disconnect the cold fill flexible pipe to confrim this. If the pressure still rises d...
The room thermostats should be controlling the motorised valves and the micro switches in the valves controlling the boiler. Worth having an registered engineer have a look to check the wiring over.
When the KW requirement for each area to be heated has been calculated, then reference to the LST manufacturers radiator tables would show the necessery rad sizes. They also show the flow temperature, to the rads, required to give the rated output. Perhaps a re-check on calculated heat requirement f...
Depending on how the system is wired, it is usual to signal the boiler from the MV micro switches. Judging by your description of the CH MV the action sounds as though the valve is faulty. Also check the wiring at the MV, should have 5 core cable. 2 driving the valve motor and 2 signalling the boile...
You are obviously have air problems in your system. You can fit auto air vents to a sealed system, however, as the air is removed from the system the pressure will drop accordingly and will have to be monitoered.
