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In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep.A fault plane is the plane that represents the fracture surface of a fault. A fault trace or fault line is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault.A fault zone is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the distinction, as the rock between the faults is converted to fault-bound lenses of rock and then progressively crushed.

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  1. M

    Worcester 30i ionisation fault

    Hi all. I hope you are well. Need some advice on this boiler and fault. E229. Went there and condensate was totally blocked so cleaned it and still not fixed. Then serviced it and still got the fault. Called up worcester and one says its the gas valve as it is making a 3 whoosing noises while...
  2. I

    F1 fault code on morco fed24ed3

    Morco feb 24ed3 has a f1 fault code. The burner reading is fine. The fault is intermittent, sometimes the boiler won't ignite on either hot water or heating. Everything seems to run but it just fails to ignite. I've changed the rectification and the spark electrodes. Cleaned the burner and the...
  3. E

    URGENT Aqualisa Quartz 9.5kw Electric Shower - Only getting cold water?

    Hello All, New to the forum so apologies if do any faux pas. But I have an Aqalisa Electric Quartz Shower 9.5kw (8 years old) and currently it is only giving out cold water regardless of where the temperature control is placed, the only difference is the more you move to the dial to the cold...
  4. R

    Vaillant Sensohome and fault codes.

    Hello All I have an ecotec 630 with Sensohome controls. Should the fault codes shown in the boiler also be reflected in Sensohome control? All appears to be working ok but the Sensohome has a fault code relating to the outside sensor (F521) which I can't seem to clear. The sensor is working ok...
  5. P

    Ideal Logic Combi 35 constant F1 fault

    Got up on Wednesday morning no hot water, (only cold water coming out of hot tap). Checked boiler, it had zero pressure and F1 fault showing. So I refilled the pressure using the filling loop, up to about 1bar which is where it usually is, which worked fine, had hot water all day. Same thing...
  6. E

    Intermittent fault on Y plan

    Customer complains of Intermittent heating on Y plan with Stat satisfied. New boiler fitted last year (no permanent live required or fitted previously) on an existing Y plan system. Existing timer was a Randall 103 (no hot water off position as its a timer not a programmer). The customer wanted...
  7. C

    Intermittent heating fault

    Hi Wondering if anyone could point me in the right direction please. We have an old traditional old Potterton E50 boiler with an old Honeywell time switch and a more recent Salus wireless thermostat. I have completely powered down and re-set the Honeywell and Salus a couple of times and...
  8. A

    Intergas boiler , vessel and PRV fault

    hello After an engineer serviced our intergas boiler, the pressure was going down continuously. He told us that the prv was faulty and quoted us £200 to have it replaced, so we asked around and the last engineer told us that the pressure vessel, PRv are both faulty and the filling loop is...
  9. C

    Programmer fault/wireless stat wiring?

    Hi guys, I have a fault on a clients heating system whereby the heating will stay on regardless of what the programmer is doing on its timed function, it'll switch off at the programmer (no light) but boiler will stay on until they turn the stat down, I went and looked at it, they said they...
  10. johnfarrell8225

    E911 fault - what is this stuff?

    Issue with Samsung air to water heat pump Over past 6 years we constantly get E911 faults, slow flowrate and temp dropping below 10c in the system. The pic below is from the external heat pump unit which has a filter attached to it. When tested we are been told this is not magnetic as we...
  11. D

    Vaillant ecoTec fault signal

    Does the Vaillant ecoTec have an output that I can connect to an external buzzer to alert me when it’s shut down with a fault?
  12. P

    URGENT Baxi Duo-Tec Combi 33 HE DHW Fault

    Hello, Looking for someone who can please help solve this problem and fix our boiler. Staffs area. CH seems fine. Boiler can be coaxed into full burn with the fan spinning at full speed, so I think everythings fine on the gas/air/flue/condensate side of things. If there is DHW demand on the...
  13. Stiltz

    Honeywell Controls Fault?

    Hello everyone! Since the cold weather started I’ve noticed that the Programer (Honeywell ST9420C) isn’t working properly. It doesn’t turn on/off in the auto pre set times in the C/H mode. It works correctly in the auto pre set times in the H/W mode. The C/H is effectively on constantly...
  14. D

    Worcester Greenstar 24i E9 with code 276 fault

    Hi, I am handy DIYer but not interested in touching anything boiler related! Just interested before I get a Gas safe engineer out what I could be looking at for what the problem is and rough cost. So in a nutshell, I put a radiator on in a room in the extension, noticed after that the pressure...
  15. E

    Ideal Logic +18, intermittent fault

    Have an Ideal Logic + 18 with intermittent fault. When on demand the display constantly changes from O to C but burner doesn’t start. Can fix by switching Off then On again, but this only lasts for a day or two. As it’s an intermittent fault I’m reluctant to call out an Engineer. Any ideas?
  16. N

    Vaillant F23 fault, Reading

    I have a Vaillant Ecotec Plus 424 boiler in a closed heating system with 13 rads and 4 towel rails. Rads are steel, pipes are plastic kind of "modern microbore". System water pressure is 1.1 bar. It's a fairly new house, built in 2016. The boiler was last serviced in January 2019. For the last...
  17. C

    Vaillant VRT392f fault thermostat controller

    Our VRT 392F wire thermostat control is not working, it lights up and you can change Deutch to English but then you cannot do anything else. Water leaked into our circuit board on our boiler but we have had a new circuit board put in. I looked at the thermostat control, changed the batteries...
  18. P

    Worcester green star 30si fault

    We have a Worcester green star 30si boiler Hot water is fine. Ch temp is set at 70 degrees but boiler heats to 68 quite fast then takes ages to heat to 72 when it finally pumps round system, Seems to be on constant low burn?
  19. S

    Worcester Boiler - Fault has the engineer stumped (video)

    Hello, My mum has a Worcester Greenstar HE30 boiler (15+ years old). Since its last service (and possibly coincidentally) it has been making a booming/banging sound randomly. This is a noise like a pocket of gas igniting and can be loud enough to make you jump. It's been impossible for the...
  20. B

    Ideal Vogue S32 Gen2 occasional ‘NO WATER FLOW FAULT’

    Hi, Following an Anglia Water complete loss of Water Supply in Milton Keynes, I had a call from a Tenant reporting the No Water Flow Fault On the Ideal S32 Gen2. When I arrived at the property I found the pressure in the System Loop was absolute zero. There were boiler manual papers out in the...
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