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Hi I'm a newbie looking for some advice. My Setup: Vaillant 418 Ecotec, S plan system. Salus RT500RF receiver+stat and wired controller. I'm switching to smart controls (Drayton wiser). I replaced the wired controller and It's all working as long as the old RF stat is calling for heat, but I...

Going back to the original question... I was told that for TADO (a similar system with zoning capability) the eTRVs effectively speak to the boiler via the thermostat, so the thermostat is still needed even though you would think it is no longer necessary. Might be similar for Wiser... Also, I...

It is the stainless steel exchanger. Is this good or bad news for a boiler that needs the overrun but has no bypass installed? Btw... I tried to run the HW+CH at the same time and then stop them suddenly to see if I could force the F72 error but no luck (i.e. it keeps working). Either I'm...

Related question... I noticed yesterday (while I was trying to force the F72 fault) that the CH and HW temperature controls on the boiler are wired incorrectly: the CH control knob controls the HW flow temperature and vice-versa. Could this cause some problems? Does the boiler behave...

Pipes are insulated but the cylinder is in an un-heated garage. I hadn't thought about the benefit of the boiler modulating... So a possibility is that F72 happens only when both HW and CH coincidentally stop at roughly the same time, not allowing the boiler to modulate down naturally. I guess...

Thank you Ian The problem is the F72 happens relatively rarely. i.e. once every 3 or 4 weeks of otherwise normal operation I have tried a few things but failed to force the error; so I don't even know when it happens (i.e. when demand ceases or when a new zone opens, etc). I just know it...

Ian: yes, honeywell, silver box, with manual lever to force open. Tony: yes, "professional" job. I think I can get him to install the bypass for free... The question was more "has it damaged my boiler"... but I'll need to check regarding exchanger type.

Yes, that's how I have timed it. >> I don't know why you would want to cut short the reheat times. To save energy... I don't need a full tank in the morning. I guess I don't understand why you are asking... is there a drawback to stopping short of a fully heated cylinder?

Tony, thank you for the quick reply. I believe the pump is powered by the boiler; it definitely runs for a few minutes after demand has stopped. I will check and get back regarding the exchanger type. >> Your F72 occurs "after CH and HW" have been used. But what has caused these demands to...

Hi Great forum btw! I have a Vaillant EcoTech 418, S-Plan system, 2 zones (HW unvented cylinder + CH), installed 1 year ago. Standard 3 speed Grundfos pump. The system seems to work, but boiler periodically (say once a month) cuts out with error F72... "Flow and/or return NTC fault". I've now...