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The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions that produces urea (NH2)2CO from ammonia (NH3). This cycle occurs in ureotelic organisms. The urea cycle converts highly toxic ammonia to urea for excretion. This cycle was the first metabolic cycle to be discovered (Hans Krebs and Kurt Henseleit, 1932), five years before the discovery of the TCA cycle. This cycle was described in more detail later on by Ratner and Cohen. The urea cycle takes place primarily in the liver and, to a lesser extent, in the kidneys.

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  1. E

    C26 Firebird wont start keep cutting off on infinite cycle

    Hello have issue with Firebird enviromax C26 its doest want to start for what ever reason it tries but cuts off almost instant and keeps trying until i switch off power
  2. P

    Boiler Short Cycles only when cover on

    Good morning everyone, Have a bit of a unique issue, ive only found 1 reference to it on the internet with no answer. For some quick backstory, in Jan 22 my CH water circulation pump killed itself. This old pump was replaced and i troubleshooted some short cycling and with the help of this...
  3. D

    Gloworm 15hxi wont stay lit ?

    Hello forum members thanks for the welcome. This is my first post. I have a Gloworm 15hxi. Its been a really good reliable boiler. I am doing some decorating in a bedroom so had to take a radiator off. When I refilled the system again everything was ok overnight but the next day there had been...
  4. N

    Ferroli 901 short cycle

    good evening, I've got an issue with my ancient however well maintained ferroli 901 boiler, it short cycles, it stays on for 35 seconds, then shuts off for approx 10 seconds and repeats all day, this never happened last winter, just this winter since turning it back on. When turned on is...
  5. A

    BOILER PIPEWORK NOISY ON HEATING CYCLE.

    NOISY HEATING SYSTEM. Morning all, I have a heating system, installed about 3 years ago and its quite noisy, boiler is first floor above lounge and when sat with the system running the pipe work seems to generate a fair bit of noise, so my question is if I lag the pipe work would that help...
  6. B

    Conventional boiler does not complete full cycle.

    Conventional boiler does not complete full cycle, stops after an hour or so - room temperature set to 22 degree and water temp set to 65degree. But, neither water nor room temperature reaches to the max level. If I switch off the water controller then heating completes full cycle. Not sure, what...
  7. S

    Boiler pressure (and short cycle) issue - not just EV

    Hi all. Looking for your opinion on this please… Large house with Worcester 40CDi system boiler, UFH downstairs, 9 rads/towel warmers upstairs. Pressure normally around 1.5 bar, goes up to ~1.7 when system hot, so all normal stuff. A week ago, pressure starts varying between 1 bar when cold...
  8. M

    Heating Cycle whats normal

    Can anyone tell me what the acceptable hysteresis ie the switch off/on points of a room thermostat is. My wife always complains it's getting cold in that period between the thermostat switching off the heating and coming back on again to meet demand.?
  9. H

    Glow-worm Ultracom 24hxi Heat Cycle Issue?

    Hello Forum, I've noticed at times that my boiler is heating in a very short cycle. 30 seconds on at full flame, heating to 65c. 30 seconds off, cooling to 37C. 30 seconds on at full flame, heating to 65c. It cycles like this for 10mins or so, then goes quiet for a period of time, then...
  10. D

    Banging water pipes when washing machine on spin cycle

    When my washing machine is on a spin cycle the water pipes can be heard banging all over the house. It s a recent thing and didn't do this before. I've checked it's not too close to the pipes. I read about water hammer but I don't understand why it would do this only on a spin cycle as...
  11. K

    Pump cycle Vaillant

    On the vaillant ecotec plus's under the installer level and program checks there is an 7.5 min programme called pump cycling which you can runderstand on your hot water or heating circuit I know what it dose ect ect bleeding the system of the air. The reall qestion is how dose it work just a...
  12. K

    Southall UB1 Engineer needed to look at my UFH/ anti cycle issue ASAP

    Hi Looking for someone to be able to come out tomorrow if they can (19th Feb) to try and resolve an antiycling issue being caused by my UFH (i think). I understand it could be to do with balancing but not sure... Basically, whenever my UFH is on, afte several minutes my boiler enters anti...
  13. K

    Newbie help - water UFH Anti cycle with Valiant ecotech 831

    Hi I'm Kash and im new here - looking for some advice/help. I'm sorry that my first post is one seeking help and not a general hello! I'm not too clued up so thought i'd post on here to get some feedback. I've used the search function and tried a few things but it hasn't seem to have done the...
  14. 6

    Gurgling in pipe at start and end of heating cycle

    Hi, I am Christiane a customer who didn't know anything about central heating until 2 months ago.I got a replacement boiler Vaillaint Eco Plus 418, new 3 port valve, new pump system flushed with inhibitor and vented I then started to have a whooshing noise and but crackle and pop which...
  15. M

    Vokera linea 28

    Hi guys I've a vokera linea 28 hot water side is fine it's the heating side I've a question about when boiler has reached its set target heat say 75 boiler starts to cycle of on now them temp does drop quick down to 58 then boiler fires back up again an repeats this so is it suppose to drop that...
  16. D

    Salus IT500 killing pump power after hot water cycle is complete

    Hi, I have a Salus IT500 controlling my vaillant ecotec 418 open vented boiler. The hot water is heated for 2 hours and when the time is up the Salus stops the water heating cycle and leaves the boiler to cool down. The boiler shows the pump symbol for the external pump running, but the salus...
  17. B

    Short cycle after a long cycle why?

    Hi Guys i have just installed a new Honeywell homexpert thermostat, I set it to do 3 cycles per hour of 4 mins. This keeps the house at a nice temp. But just recently after 6 days of installing the stat, it will do a 15 second cycle just after it finishes it long cycle. I would say it happens...
  18. R

    Noisy washing machine during spin cycle

    Hi my washing machine (hotpoint aqua) is coming 5 years old but its suddenly gone very noisy during spin cycle! It rumbles and churns, quick google suggested check its not vibrating against wall and the feet are level. Have tried this but no joy I think the drum bearings maybe the fault ? Does...
  19. J

    Worcester Condsen. Boiler. Intermitten CH failure. Me and Gas man at witts end

    Sorry to be long winded but..... Holiday Flat. 5 year old Boiler in loft space. Working Perfectly until Oct 2013 -Worcester/British Gas fit Model ZWB 7-29 CC1 Background - We have the thermo set for practically 24 hrs over 2 cycles at 15c. 08.30am -20.29 & 20.35 - 08.25am. (specific reason...
  20. J

    Pipe Knocking During Dishwasher Cycle - Water Hammer

    Hello, I have spent ages looking on the internet to try and find a solution to this issue, and I apologise in advance as I know similar questions have been asked about this topic on here several times, but I would like to explain my specific issue with the hope someone might be able to come up...
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