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Search results

  1. J

    Restrictor elbow gas leak

    Hi all, I did a landlord gas safety check this week. Drop test showed a 2mbar/2 mins leak. But off I went to find it. I found the main leak on an old cooker. The tenant could smell gas, but only when the cooker was being used. So I condemned it, and recommended a new cooker. I also found a leak...
  2. J

    expansion tank overflowing - a big puzzle why

    Hi all, My customer's f&e tank overflow has had a steady trickle. When the hot water is turned on, it gushes. I initially changed the ball valve (shutting off perfectly) and stiffened the side of the tank (it was flexing out, but otherwise been in for years with no issues), then realised the...
  3. J

    flue too close to window

    Hi all, I'm about to quote on a boiler install for a customer. The current flue (from pre-existing combi) is only 180mm above the openable window. The distance should be 300mm. The new flue hole can't be re-drilled any higher. I've warned the customer it may be they have to permanently...
  4. J

    flue gas analysis - too much O2

    Hi all, Could I check I correctly understand fga readings taken off an old Microgenus combi. The ratio is great (0.0003%). CO2 is only 3.4% (should be 7.62), O2 is 15% (should be closer to 7%, according to the boiler manual). CO was 33ppm. The ratio passes the gas safe requirements. However, the...
  5. J

    plastic pipe fitting failed - why?

    I came across one of these fittings last week, that had popped under the bath...
  6. J

    vertical radiator - will it warm the room?

    Hi all, My customer wants to install a vertical radiator in his living room (to replace a conventional double panel/single fin rad). His reasons are aesthetic. We've done a heat loss calculation through the website bestheating.com, through which he intends to buy the rad. The loss is 1.28...
  7. J

    leak detector/stop tap

    Hi all, I have a customer/landlady, who would like a leak detector/stop tap fitted in her rental property. She's after a valve that will sense a water leak, and shut off the water supply in an emergency. Is there anything you'd recommend? Thanks for your advice, Jennie
  8. J

    Secondary heat exchanger - flow/return temperatures

    Hi all, I'm a Gas Engineer, and new to fault diagnosis/repairs. I've measured the temperature on the flow/return pipes across my combi's secondary heat exchanger, with the hot bath tap on full. I have a Vaillant Ecomax 24 (year 2003). The flow was 70c, the return was 43.8c. I'd be interested...
  9. J

    Stiff shower valve - how to proceed?

    Hi all, My customer has a Mira Gem 88 mixer shower. It's 12 years old, and has recently become tight to turn (most likely scaled up). It runs from a combi boiler, and has isolation valves on the pipework. How best to proceed? (I'm new to shower repairs). I suppose my options are: 1-Take it...
  10. J

    Run open vented hot pipe to tundish/waste pipe??

    Hi all, My customer has had a legionella assessment done, as part of renting out her house. She has a fairly new, open-vented CWST in the attic. The hot water vent pipe discharges over the CWST, as is standard practise. However, the assessor says this is a legionella risk, and has recommended...
  11. J

    servicing a gas fire

    Hi all, I've got a theoretical question about servicing gas fires. When you take the gas fire out of the chimney (to do the smoke test, etc), do you routinely dismantle the pilot/burner pipes and injector and clean them as well? By blowing compressed air through the dismantled pipes? The gas...
  12. J

    porcelin leaking?

    Hi all, I've been out to fix a leaking toilet this week. It has a low-level cistern, hung on the wall. The customer reported a very very slow leak, coming through from the flush valve under the cistern, continuing when the toilet wasn't used for any length of time. It has a dudley turboboost...
  13. J

    bath mixer taps - temperature jumping

    Hi all (again), A friend of mine is reporting jumping temperature on his bath mixer taps (when having a shower). I've said the thing to check is the water temperatures/flow rates from the boiler. He has a combi, which is about ten years old. But is it possible the taps are at fault? In...
  14. J

    Level 3 plumbing: upgrade 6035 to 6189

    Hi all, I'm studying for my level 3 plumbing at my local college. I've been put on the 6035 (technical cert) route. I'm coming to the end of my first year (two year, day release). I've recently found f/t permanent work as a plumbers mate, and have the opportunity to get the onsite experience for...
  15. J

    water heating only on combi?

    Hi all, I've got a question on behalf of a friend: Can you connect the F&R together on a combi boiler and use it just as a water heater? Thanks all, Jennie
  16. J

    stoptaps and air in pipes???

    Hi all, Just wondering if I missed something on a job today? A simple job - to rewasher a basin tap. The house was on a combi boiler (which I switched off) and then turned off the internal stopcock under the kitchen sink. Water still trickled through the cold taps even after a couple of...
  17. J

    how to remove kitchen tap spout

    Hi all, I've been given an old tap to play with (my customers originally tried to replace the spout, but couldn't remove it - so got me in to fit a new tap). Meanwhile, I've been trying to remove the spout - just for fun. It pulls out about half an inch, but then no more. Turning the spout...
  18. J

    combi boilers

    Hiya all, Just wanted to check something regarding combi boilers. We haven't yet studied them in depth at college (level 3). Someone confused me lately. Say I turn the water off at the stopcock (to fix a dripping tap, etc). Can I leave the combi on? Can the heating stay on? My understanding...
    • Jennie
    • Thread
    • boilers combi
    • Replies: 8
    • Forum: Boilers
  19. J

    replacing a stop tap (without getting wet)

    Hi all, Just a theoretical question... A while ago I changed the head gear of a stop tap. I was told a bit of water might come out of the opened valve - it came gushing out. Luckily I had a bucket underneath, and the new bit in my hand - I whipped the new tap in super fast. I was surprised by...
  20. J

    blocked CWSC overflow?

    Hi all, I've heard it is quite common for over flow pipes on CWSCs to block. Is this true? In which case, how and why do they get blocked? And how would you test it (ie, hold the ball valve down and force the water to overflow)? Do you routinely test the overflows when fitting a new FOV...
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