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demand

In economics, demand is the quantity of a good that consumers are willing and able to purchase at various prices during a given period of time. The relationship between price and quantity demand is also called the demand curve. Demand for a specific item is a function of an item's perceived necessity, price, perceived quality, convenience, available alternatives, purchasers' disposable income and tastes, and many other options.

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  1. T

    Alpha CB28X CH turning on with no demand

    Can anybody advise please. The boiler is set to HW only but the radiators are being heated - the burner is staying on all the time. Tried turning CH thermostat to zero but makes no difference. HW working fine. Any advice would be much appreciated.
  2. A

    Vaillant TurboMax 242E combi - no CH and CH demand indicator stopped lighting up

    Hi all, I've got a Vaillant TurboMax 242E combi boiler, it was working fine so far, but this morning when I tried to turn on the CH (using external thermostat), CH did not start, CH demand indicator does not turn on, and there is no hot water in CH (but tap hot water works fine). I checked PCB...
  3. A

    Worcester Bosch 24CDi HW demand temperamental

    HI there I'm a newbie here, so go easy on me please! Recently had a new bathsuite fitted with monobloc basin mixer and bath mixer/shower. coincidentally, since install, combi HW demand is bit hit and miss. sometimes basin mixer on hot doesn't activate the red light on the boiler, then if i...
  4. I

    Boiler heating hot water cylinder only on hot water and heating demand

    Boiler heating hot water cylinder only on hot water and heating demand Hi all i have a problem, at a job where the boiler only heats the hot water cylinder when the hot water and heating are on demand via programmer. When on just hot water the flow gets hot but the return doesn't, then the...
  5. M

    Vokera compact/sabre he lockout on demand

    Hi all, swtiched boiler off, drained down, fitted some new rad valves, filled up, vented up and boiler wont run, everytime i call for heat i get a flashing red led. The pump will run but im not even getting power to the fan. Is it likely to be the flow switch on the pump?
  6. J

    Gas Engineer Demand ?

    Hi All I wanted to follow a full itme course to be Gas Engineer if there is a job opportunity and a very good demand. Can anyone advise me on it . I do not want to invest around 6000 pounds if there is no demand for this sector. Thanks
  7. R

    ferroli optima 700

    just been up to my daughters new flat in leeds:driving: and gave the gas plumbing and heating a good check over (as you do)lol. the landlord arrived as i just finished so gave him an earache of the problems and faults that i had discovered:boxing_smiley: such as; gas pipe to cooker hanging of...
  8. B

    Boiler shutdown

    Hi guys, hope some bright person on here can shed some light on the cause of this problem. I did a gas safe check on a Ravenheat Primary AAA on Wednesday and had to replace the gas valve yesterday due to it passing on lockout. As usual, before working on an appliance I checked the basic...
  9. K

    Heating comes on when not on demand/

    Recently I hadall my underground central heating pipes replaced with new over ground pipes.Radiators with thermostatic valves were also replaced at the same time at ahuge cost by British Gas. I have a Worcester Bosch Combi Boiler Model 37ICC2also installed by British Gas 10 years ago. Since...
  10. L

    Central Heating Won't Switch Off

    I am unable to turn off the radiators despite the programmer/controller saying they are off, even after I switch the radiator switch off on the boiler, the radiators still stay on. I have an Eco Tec plus 824 combi boiler. Some help would be greatly appreciated.
  11. S

    Advice for oil-fired newbie

    Hi This is going to sound really stupid.... I've bought a new build house with a Firebird Combi C. I haven't actually moved in yet, so all I have is the Enviromax manual, which seems to be about 99.9% technical detail with very little in the way of operating instructions. It has a dual timer...
  12. R

    Which boiler

    Hi guys I have been asked to quote for new radiators in a very large house - 6 beds 1 main bathroom 1 on-suite and 1 downstairs toilet. There are currently 13 rads on the system and will be 15 with the 2 they want adding on. The boiler thats currently in is a main 30kw combi. Ive worked all the...
  13. D

    ferroli optimax 25s Boiler wont ignite!!!!

    hello all, I am a rgi with lpg but never do breakdowns but a friend called me yesterday that his boiler stopped working. The problem i have is with a lpg ferroli optimax 25s not lighting up when demand is called for. When demand is called the boiler goes through its process of igniting and gets...
  14. S

    Boiler burner keeps cutting back to pilot but demand is unsatisfied

    I am trying to trouble-shoot my parents' old system. They have an old Ideal Standard 50E CF boiler. Runs well (we keep thermocouples changed from time to time). Very simple system. Recently the boiler lights (no pilot troubles), then loooong before the demand is satisfied, the boiler cuts...
  15. G

    Baxi combi instant 105e calling for water constantly ?

    I have been called out to a Baxi combi Instant 105e that is calling for water constantly. There are no signs of a leak on the DHW side and the preheat is working fine and switched off. I presume there is a fault with the pcb. Has anyone come accross this problem and could help please. Thanks...
  16. G

    Glow worm Compact 100e problem

    When I turn the boiler on, the hot water demand light illuminates even though there are no taps open? As this model puts water before heating, I can't get the heating to work. Very cold, need help please!!!!
  17. K

    Ideal classic system boiler, s-plan

    Hi All, Need some advice, ive been called to a property with an ideal classic system boiler, s-plan with un-vented cylinder. my customer complains that the boiler is firing up when there is no demand. I have looked into the obvious areas, firstly checked zone valves all seem to be working fine...
  18. M

    Confirmation needed!

    Hey all. im a plumbing and heating engineer that mainly deals with installs but my mother in-laws boiler is playing up. the heating is constantly on even tho the room stat is not calling for heat. i have come to the conclusion that its the diverter valve sticking as when i tap the valve it shuts...
  19. B

    flexicom goes to F1 afterapprox 2 hours, every time

    flexicom 24cx goes to F1 error and stops after 1hr 45 to 2hrs 15 every time without fail. Probe was v hot so changed, but still same problem. Will not restart till round an hour has elapsed. At start of 2 hours, accepts demand for hot water but later in the 2 hours, demand for hot water...
  20. R

    Can the combi boiler componentry draw air into a sealed system?

    I have a WB Greenstar 30 HE.It is 6 years old.I have 4 rads downstairs 2 0f which are new in the summer,upstairs i have 4 also.When the system is off the pressure is at 1 bar and has been all summer so have no pipe leaks.The AAV started leaking water at the end of last winter so have recently...
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