Recent content by RK_London

Your ABV comments were on my thread ' Central Heating Port Valve Water Hammer' 13th December Vaillant engineer said exactly the same as you about the internal bypass on this Boiler. He said because it's 37KW, can take ages to lose heat so external bypass is needed to get flow temperature down...

My boiler does fire up at 65% max output but didn't hold this for more than a second or 2 in the three tests I did. Will set anti-cycling time to 35 mins. An external ABV is fitted ( discussed with you on a separate thread). Vaillant engineer insisted it was needed on this boiler, which is...

Just checked the last 3 cycles. Boiler fires up for about 3 minutes 30 seconds then goes into pump over run before repeating. Did 3 test cycles, 1st test cycle :Flow temperature was at 60C then went into pump overrun ( set for 6 mins as anticycling time is 6 mins at target flow temp of 60C)...

thanks - I have 13 radiators with a total output of 13KW if all used at max setting so 14KW setting should be ok

I have a Vaillant ecotec plus 637 boiler installed about 5 yrs ago as a S plan plus unvented installation. Question I have is the room stat is 1.5C below the set level (20C) but the boiler flow temperature is around 42C when the target is set at 60C. The boiler is oversized and I set the power...

You mean close the external bypass fully?

How do you check if CH orientated correctly?

Tested for a two days and there is a slight improvement but problem still persists - banging in pipes around the house which begins when port valve closes and boiler goes into pump over run. Banging lasts for a few minutes then repeats end of the next heating cycle. Is there a way to test if...

How long do CR123A batteries last?

if the batteries in the wireless detectors run down before I replace them, am I right in thinking the only issues is I won't be able to set the alarm.

Toilet is connected to mains. Using a Geberit 380 fill valve - will take a look to see if it has a flow limiter

ok - will test over a few days

You are right - it is circulating at all times. Will adjust. Thank you for your help.

I've attached a picture of the two wireless detector types - can you help in figuring out what batteries I need

Only the central heating valve . It is interesting you are asking the question about the bypass valve installation. Boiler initially installed without external bypass because plumber said this boiler had an internal bypass. When I got a Vaillant engineer to do my annual service he wasn't happy...