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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. 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...
  2. S

    Could this be my boiler's fault?

    Hi there, the water flow in our shower has reduced considerably since we bought our house, meaning the hot water tends to cut off after a minute or two; the shower is fed by a combi boiler: Worcester Bosch RD532i, about 17(!) years old I think. I can't really say if the water pressure in the...
  3. K

    Glowworm fault flashing F then - -

    Has anyone ever seen a flashing F. then - - on a glowworm?
  4. J

    Potterton combi gold 28 HE, fault?

    Good afternoon all, I am a commercial gas engineer so little experience with domestic (although fully qualified). I have a problem with a Potterton combi gold whereas I initially had no heating. I looked at the actuator on the diverter which was not driving so for £12:50 I just ordered a new...
  5. T

    Kitchen tap design fault?

    I recently installed a C&L Bilbrough tap from B&Q in a new kitchen. Its the one with a a spout with a switch on it as well as a spray head with switch in additon to the hot/cold mixer/volume control. I have found that if both the spout and spray head are closed off and the mixer valve open...
  6. M

    2 port valve fault finding?

    Hey guys. What’s the easiest way of determining that a 2 port motor has failed? I know that if the stat is calling and the arm is set to open on the valve and the actuator is ok it will fire. Is it purely a case of checking whether 240v is at the brown and orange when heat is called for? Any...
  7. F

    Ferroli fault every Sunday

    Hey there. We have a Ferroli boiler in our commercial premises. It is set on a schedule for 9-5 Friday and a few hours on Saturday and Sunday mornings. Every Sunday morning we come into an error code of A01. I know what the code means but what I wanted help with is why does it happen on the...
  8. MrGatch

    Possible fault two-port valve

    Hoping you guys can help confirm the diagnosis of a fault before I call a plumber. I've lost heating to the upstairs zone on my heating sysem. System boiler is working fine feeding two other zones and the hot water. The zone is connected via a Nest, which is saying its calling for heat but...
  9. balders99

    Plumbing or Appliance Fault?

    Had a new Kitchen fitted just before Xmas with integrated Washing Machine and Dishwasher (never again!) Appliances are located around 3.5m away from the sink, in a corner, sink one side, appliances on the other. All hose lengths within manufacturers recommendations btw. Washing Machine drum...
  10. S

    Fault finding at Skills TG, Paisley

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  11. L

    Advice on fault finding courses

    Hi, I currently work on new builds with very limited work on the repair, maintenance and fault finding side of boilers. I’m currently renewing my ccn1 and cenwat gas card as I type this and it has made me very interested in getting into this line of work or even have a better understanding of...
  12. T

    Drayton MA1 mid position actuator intermittent fault.

    Can anyone advise what could be the cause and how to overcome an actuator intermittently not responding when boiler is calling for heat. Possibly slightly loose fitting to valve, as actuator re-activates with hand pressure movement when boiler is calling for heat. This is an intermittent fault...
  13. moonlight

    Worcester Bosch Fault code P3

    A customer rang this morning, says they have a intermittent fault on the boiler P3. Its a Worcester CDI30 I think from a past visit. I did quote for a new boiler 10 months ago, but the old one is still hanging in there. I looked on line as I don't have the book with me. Any suggestions? He says...
  14. seanadams121

    Ferroli f34 fault for my sins

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  15. M

    Electrical fault finding?

    Hi guys. I’m still very new to boiler fault finding but was wondering whether you could advise me on a particular multimeter or tester that would help with fault finding? The wife has been a good one and got me a Martindale ET5 open jaw tester but I’m unsure whether they’re any good? I can’t...
  16. D

    F75 fault with Vaillant when pressure is okay

    Can someone help me understand what could be causing this fault? It only seems to happen when the pressure in the boiler drops below around 1.5 - 1.7 bars otherwise it works fine. The boiler is a Valiant Eco fit pure 835 and the building is a 3 storey house with 10 radiators. Thanks
  17. N

    Honeywell ST699 switching fault

    Honetwell St699, will switch on in once mode at desired time but won't switch off at desired time will just continue, any ideas would help greatly
  18. D

    URGENT duo-tec 28 fault code e168 new PCB

    Duo-tec 28 fault code e168 PCB replaced PCB turned boiler on same fault code e168 could it be a faulty new PCB or am I missing something
  19. B

    New Grundfos UPS3 15-50/65 130 Circulator pump fitted no heating and hot water - FD Fault code

    I have a 5 year old Ideal Logic 15 boiler that has been working alongside an old Grundfos pump possibly about 10years old. The boiler was recently (about 3 weeks ago) repaired and services by an Ideal technician. I had a plumber yesterday from Local Heros who came to fit a new Grundfos UPS3...
  20. T

    My double flush toilet has developed a fault. It won't stop filling eve when I pull the float arm right up. I have replaced the inlet valve diaphragm

    My double flush toilet has developed a fault. It won't stop filling eve when I pull the float arm right up. I have replaced the inlet valve diaphragm but this has made no difference What else can i try?