Recent content by apick1

Hi As this site has helped me keep my Vaillant VCW 242 Combi Boiler going for the last 20 plus years without an engineer callout, I thought I better share my latest fault and repair finding with anyone who still has one these comi's. So here's what happened. The boiler appeared to be...

Sounds like you have found the issue. Since my original post I've renewed the Diaphram pump and the Heat exchanger both from Ebay sources. Its worth keeping an eye at whats available as you can get new parts cheaply and keep them as spares. I wouldn't change the heat exchanger unless you see...

Yes it is an old post and my VCW 242 is still going strong. My hot water is running at about 48C with the flow control (water temp setting) at about mid way. Stick a thermometer under your tap and see what you'r getting. Re. The diaphram pump look at the flame with central heating running...

Checked out the diaphragm pump. There was no evidence of suction or pressure from the outside. Romoved unit from main controller, left it connected and switched on system. The pump vibrated as it should do when operating. This can't be detected without removing it from the unit as it is...

Nothing changes when the green light comes on. No vibration from the pump or change in flame. I'll check all the tubes again and see what I can find. Thanks.

Thanks for the reply, I appreciate you taking the time. Here's my response: What I mean by 'Water Section' is the unit that has the DHW temperature control knob on it. This was changed because it had seized and the DHW temperature couldn't be altered. I've got the DHW temperature turned...

Hello I have a Vaillant Comi Model VCW GB 242 EH for which I can no longer get the Hot water to increase to a reasonable temperature. The DHW temperature adjuster produces mildly warm water when turned fully on. The complete water section was replaced about 6 Months ago so I don't...