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Vaillant VCW 282
A recent problem with this boiler is the flame not modulating to full both in CH and DHW modes, which is causing the radiators to warm up slowly and the DHW to not get hot enough.
The hydraulic control system is seemingly working fine, the Differential Valve opens the Gas Valve as it should and the Gas Operator is letting gas through to the Burner.
When I disconnect the banjo coupling to the Gas Operator and manually blow into it, the flame will then modulate to full, which indicates that the Gas Operator is working fine and the fault is with the pneumatic flame control system.
I have replaced the Restrictor on the Gas Operator; the Diaphragm Pump; the Flame Supervision PCB and the Temperature Control PCB. All of the pipes have been blown through and the Gas Operator was replaced 3 years ago, with the burner pressure having been correctly set.
When I replaced the Diaphragm Pump, I reused the two white plastic elbows and noticed that both have identical splits in the ends that push onto the pump. With these splits being identical, I assumed that they are manufactured this way, is this correct, or could these splits be causing the problem?
+++++++++++++++++
Moderator's note
This forum does not support DIY gas work.
++++++++++++++
Note. After marking the starting point, I have tried turning the right hand adjuster clockwise on the Gas Operator, to see if the flame increases and it doesn’t alter at all.
Does anyone have any suggestions please?
Thank you
A recent problem with this boiler is the flame not modulating to full both in CH and DHW modes, which is causing the radiators to warm up slowly and the DHW to not get hot enough.
The hydraulic control system is seemingly working fine, the Differential Valve opens the Gas Valve as it should and the Gas Operator is letting gas through to the Burner.
When I disconnect the banjo coupling to the Gas Operator and manually blow into it, the flame will then modulate to full, which indicates that the Gas Operator is working fine and the fault is with the pneumatic flame control system.
I have replaced the Restrictor on the Gas Operator; the Diaphragm Pump; the Flame Supervision PCB and the Temperature Control PCB. All of the pipes have been blown through and the Gas Operator was replaced 3 years ago, with the burner pressure having been correctly set.
When I replaced the Diaphragm Pump, I reused the two white plastic elbows and noticed that both have identical splits in the ends that push onto the pump. With these splits being identical, I assumed that they are manufactured this way, is this correct, or could these splits be causing the problem?
+++++++++++++++++
Moderator's note
This forum does not support DIY gas work.
++++++++++++++
Note. After marking the starting point, I have tried turning the right hand adjuster clockwise on the Gas Operator, to see if the flame increases and it doesn’t alter at all.
Does anyone have any suggestions please?
Thank you
Last edited by a moderator:
