Recent content by Harvo

I'd say between 1-2mm diameter. I presume the entry holes caused by the grubs when they first hatch from the eggs are so small you can't see them. They then munch away for a year or two and eventually eat their way out when ready to change into beetles. Is that when the dust is produced...

Hello, While out walking the dog 4 or 5 years ago I came across a recently felled beech tree that was cut up into various sized pieces. I liberated a few sections, took them home, stripped the bark, cut them roughly square and then left them to season/dry in the garage. Over Christmas I...

Hi. This relates to a post I put up on 19/11/08, but there’s now been some progress. The problem relates to air continually getting into radiators and the F & E tank filling with hot water and overflowing when the central heating pump is running. The system is about 40 years old, open...

Thanks for all the advice. Here’s a progress report - hopefully this thread hasn’t gone cold! On Monday might I partially drained the system sufficient to remove the one way valve and replaced it with a full-bore 22mm isolation valve as JohnD suggested, so no possible restriction there. I...

I put sludge cleaner in the system back in the summer after the problem I had with the blockage in the HW cylinder coil and drained it out some time later. I suspected there may still be some sort of blockage or restriction so last weekend I also did a mains flush, but the waste water was...

I only tried it once. The rads all cooled and I presumed the pump had stopped. Turned it back to 3 and it started pumping again. Its an old pump and it may just have dirty connections, but for years its been set at 3 and everythings been fine.

The outlet from the bottom of the F & E tank is connected by a pipe to a tee joint to the feed to the HW cylinder coil. The vent is an extension of this pipe and simply rises above the tank and is bent over 180 deg. I've never seen or heard it drawing air. Wouldn't the tank have to be empty...

Can anybody figure out what’s happening here? I have an open vented system with a gravity circuit from the boiler for the hot water and central heating on a separate pumped circuit from the boiler. It serves 13 radiators on a ‘one-pipe’ arrangement and has worked well for years. In the...

Thanks for the advice. I had been thinking of doing a mains water flush of the central heating circuit, since a blockage or partial blockage was all I could think of that may be behind this. You mention the gravity check valve. I only recently fitted one on the central heating feed from...

The feed pipe and vent pipe are one of the same on my system. The F & E tank feed comes from a tee on the feed to the HW cylinder coil. It branches off to join the bottom of the F & E tank and than continues up and is bent over to act as an overflow.

I know there have been loads of posts about this sort of problem before, but please bear with me. My house has a 40-year old open vented system with an oil-fired boiler. It has a gravity circuit for the hot water controlled with a 2-port valve and a thermostat on the HW cylinder. The...