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FAQ & Troubleshooting

No of flashes Symptom Action required Action required by qualified personal
2 Water level below elements. Normal when machine first fills. Check water pressure. If this is OK the low level probe is possibly covered in limescale/ mineral deposits Clean low level probe/ descale machine.  See instruction video here.
3 Temperature sensor failure (o/c) Call service agent Check temp sensor( red cable entering the tank part No 1600691) is securely fixed to PCB and that the cable is inserted fully into the boiler tank hole with heat paste present.
4 Water not heating Call service agent Check heating circuit wiring, all connections secure no burning. Check thermal overload switch where fitted is pressed inward. Check heating element resistance with machine plugged out of mains socket is reading 18-22 Ohms. If within resistance range and wiring circuit is ok, replace main PCB 1600345 for Ecoboiler range.
5 Temperature sensor failure (s/c) Call service agent Replace thermistor connected to PCB. Failing this replace PCB board 1600345 for Ecoboiler range.
6 Machine not filling Check water pressure. If OK  switch machine off and on again. If problem reoccurs – call service agent. Check water pressure. If filter is fit bypass to check if filter is blocked. Check for kinks in hose and inlet valve is switched to open position.
  • A: If water pressure is ok, descale is required to clean the probe assembly which detects the water level. See instructions below.
    • Descale and level probe video: click here
    • Descale and level probe written instructions: click here
  • A: Refer to the installation details of your specific model on individual product pages.
  • A: Refer to the spec sheets of your specific model on individual product pages.
  • A: From time to time Marco makes changes/ updates to the model range and releases Technical Bulletins. Click here to see all Technical Bulletins.
  • A: Refer to the spare parts details of your specific model on individual product pages.
  • A: To order a spare part email the part code and your details to: spares@marco.ie

Display pattern:

  • 2 flashes then a short pause – repeated

Electronic check and action:

  • This indicates that the low level circuit is open i.e. the probe is not in contact with the water.
  • The element is switched OFF at this stage and the inlet is left ON. (Note that if this is a low probe wiring fault, the water will stop at the high level probe regardless of the status of the low level).
  • This is a recoverable error i.e. the machine does not need to be reset when the problem is solved. (e.g. if a closed mains water stop valve is the problem, opening the valve will allow water into the machine and normal function will resume when the low level probe is reached)

Probable causes:

  1. The water level is below the low level probe, which is normal when the machine fills for the first time. (Can be flashing for up to 2 min at start up)
  2. The low level probe wire is disconnected, or there is another wiring fault (eg. a bad earth (return) connection between the PCB and the Tank)
  3. Low level probe has scale or mineral deposits on the low level probe metal tab preventing a reading of the water level.

Action required:

  • Check that the water pressure is OK and ensure that the stop valve is open.
  • Clean low level probe with scotch brite. See Descale and level probe cleaning procedure.

Display pattern:

  • 3 flashes then a short pause – repeated.

Electronic check:

  • This indicates that the Thermistor is measuring such a large resistance that it assumes the thermistor circuit is open.
  • The element and inlet valve are turned OFF when this error is detected
  • This is a recoverable error. When the correct range of resistance is measured, normal operation resumes

Probable causes:

  1. The thermistor probe is unplugged from the 4way connector on the PCB or the thermistor has failed open circuit.

Action required:
Check that the thermistor is plugged in to the PCB correctly. If it is, replace the thermistor.

Display pattern:

  • 4 flashes then a short pause – repeated.

Electronic check:

  • This checks that the temperature is increasing when the heater is on.
  • Measures the rate that the temperature increases in a specified time. This error is only displayed after 20 mins of the heater being on continuously. When the error is detected, the element and inlet valve are turned off.
  • This is a non-recoverable error. The machine needs to be reset when this problem is solved.

Probable causes:

  1. The elements have failed
  2. Wiring fault

Action required:
Check that the resistance on the elements. If there is a reasonable resistance (18-22Ω) on the element it probably has not failed, so the wiring might be at fault or the PCB board has failed.

Display pattern:

  • 5 flashes then a short pause – repeated.

Electronic check:

  • This indicates that the Thermistor is measuring zero resistance. It assumes the thermistor has failed sort circuit.
  • The element and inlet valve are turned OFF when this error is detected
  • This is a recoverable error. When the correct range of resistance is measured, normal operation resumes.

Probable causes:

  1. The thermistor has failed.

Action required:

  1. Replace the thermistor.

Display pattern:

  • 6 flashes then a short pause – repeated.

Electronic check:

  • This checks that the water in the tank cools when the inlet solenoid valve is switched on.
  • This is a non-recoverable error. This checks that the water in the tank is cooled by when the inlet solenoid valve is opened. If the water pressure is within the specifications (5-50psi), the inlet solenoid should not be on for more than a few seconds. If this water temperature has not decreased by the required amount

(1 degree per minute), the inlet solenoid is switched off and the 6 flash cycle is displayed.
Probable causes:

  1. Mains water pressure problem or the mains water stop valve is closed.
  2. Inlet solenoid valve failure.

Action required:

  1. Check the mains water supply. (Note: Temporary loss of water pressure can occur in certain sites – particularly when various machines are plumbed to the same mains water supply.) If the water supply is ok, reset the machine (switch the machine Off and On again). This will reset the error and if the water supply is ok, the machine will return to normal operation.

NOTE: If the water supply is the problem, ensure that this is rectified or this error will re-occur.

  1. If there is no problem with the mains water supply, check that the inlet solenoid valve is working.