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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. J

    iMini 30 Combi Boiler - L2 Fault Code

    Morning - hoping someone can help with a problem we've had for two days. Our iMini 30 Combi boiler doesn't seem to be working consistently. We're getting an L2 Fault code and when we try to reset it, the machine has a low rumble/gurgle sound for about 10mins before displaying the L2 fault code...
  2. B

    Worcester 15Ri intermittent fault.

    Has any one got any ideas?? Greenstar 15Ri gas boiler. Works fine sometimes with out fault, but every now and again it just stops like it has no power. Blue light goes out and nothing happens, still have 240votls on the board. Light comes on, fan tries to run then light out and nothing, yet...
  3. G

    Greenstar 34DCI Classic intermittent fault

    Hi Folks, I have a puzzling issue that I hope someone could help diagnose. The mother-in-law has a Greenstar 34DCI Classic that has worked fine for ~7 years (without a service ). Recently it has been intermittently cutting out and requiring a reset and displaying an "EA" error message on the...
  4. Andyh

    Saunier duval Xeon 60ff fault

    hiya fellas , ( I'm GSR but don't have the blue icon yet after my username ^) I attended a breakdown last night on said boiler The voltage through the aps and fan was spiking and the fan would run for a second then cut out .....continuously... Rang helpline but ( glow worm/ valliant) don't...
  5. S

    Ideal isar l9 fault.....again

    Evening guys and gals, just had a text from a tenant in a house I look after. An L9 fault has now developed( overheat) would this be the pump failing/ failed, non functioning auto air vent or sensor. Thanks in advance And yes, I know it needs ripping out.... but you know what landlords are like
  6. robj20

    Ideal Vogue "Flow/Return Thermistor Fault" again.

    Boiler, Ideal Vogue Gen2 C32 Honeywell Evohome with Opentherm. Had Ideal out last year and they changed the thermistor, but this year its doing it again. Strangely same time of year. Suggestions last year from the installer was to remove the Evohome TRV from one radiator to act as a bypass. I...
  7. S

    Ferroli Optimax f34 fault

    Is the f34 fault on an Optimax a new PCB or should I be looking elsewhere?
  8. A

    Ideal logic l2 fault

    Hi I have just had a friend of a friend message saying her boiler doesn't work. From what she is saying it's displaying L2. I'm reluctant to race round there right now as she wants a quote to repair so unlikely she will want to pay a fee for me going on a Sunday evening. She has an immersion...
  9. hammers4spanner

    Worcester greenstar intermittent fault

    Attended this on friday heating and hotwater cut out after about two minutes , slow flash on blue light mainly on. Reset boiler and same same, replaced flue stat and temp stat but still same fault .
  10. Bibbs118

    Vokera intermittent fault.

    Hi guy's, looking for a bit of tech help on this job. I've not been yet, I'm going on Wednesday, another Engineer has been but says he can't find anything wrong with it. Apparently it locks out after being on for 15 mins. I had one like this a few years back and I tried loads of things but...
  11. Pauld1962

    Unvented heating system, unusual boiler fault

    Called to a customer today and the system boiler keeps repressurising on its own ... After I dropped out all the pressure I watched as it refilled ... The filling loop was disconnected at the time ... Customer reports that it's never done it before ... The only way I could stop it was to turn...
  12. C

    strange fault with baxi solo 2

    hi guys ive got an odd fault with my baxi solo 2. when its fired up its working fine...however it doesnt start on its own. on start up, all the correct red lights come on: boiler on fan on ( and it is on. I can see it spinning) pilot on. I can hear ignition sparking but it wont ignite on its...


    Hello, I fitted a new pcb because the old one was not sending power to the fan. All working correctly until I put the case back on. Now it shows 40-50-80 flashing on the diagnostic lights. This is not shown in the diagnostic chart.Pump runs and the fan runs if there is a demand for c.h. or...
  14. king of pipes

    Alpha cd 18s boiler fault

    Have a boiler playing up at the minute with ignition problems everything pointed to the gas valve monometer on the outlet proved it was not opening, the gas valve was replaced still nothing but have gas and a spark, checked the flue for restrictions, electrodes and rectifacation, heat exchanger...
  15. Ted808

    PROTHERM, combi boiler, F1, fault

    I've not seen this make of boiler before- has anyone any experience on them? Protherm 80E
  16. Darren Jackson

    Viessmann Vitodens 050-W F2 Fault code

    2 engineers were called prior to me getting the call. The customer having problems with the hot water and it constantly faulting to F2 within 10 seconds of running a hot tap after every reset. 1st engineer changed the Button Stat to the main hex & charged her £120. Still same problem! 2nd...
  17. Hobo128

    Main 24he hot water fault

    Main combi 24 he. When i open the hot water tap the pin from the diverter only comes out slightly not enough to make contact with the micro switch. I am going to change the diaphragm tomorrow with hope that this will solve it which it usually does but i have had it where it doesnt make much of...
  18. Nuttyboy

    Remeha avanta 28c fault f13

    Hi i have a customers boiler flashing f13 no not water but works on heating
  19. plumb_know

    How do you approach fault finding??

    Hi Everyone, Still in my 1st year of being gas safe and went on a fault finding course as soon as i qualified but in all honesty it was a bit too much information to take in one go for me. so now i keep forgetting bits and getting confused. I was just wondering if you have a set procedure how...
  20. Inverness

    U7 fault code Worcester 37 cdi combi

    hi guys went to a breakdown today. No hot water and the numbers keep rising up to 97. I can't find fault code in manual?! I think it's something to do with the pump not circulating and over heating? Also I noticed when I was there the vertical flue runs in through the middle of the property into...
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