Error codes and malfunctions of the Mora gas boiler

Czech-made water heating and heating equipment Mora brings warmth and comfort to the homes of many users. The devices are designed for a long service life, during which breakdowns can occur. The gas boiler “Mora” is prone to malfunctions, so we will indicate the typical problems of the brand. You will learn how to deal with breakdowns on your own.

Features of operation

A wide range of models allows even the most demanding customer to choose the equipment to taste. “Mora” represents wall-mounted, cast-iron boilers, powered by gas, electricity, combined, indirect heating.

Let us dwell on gas single-circuit and double-circuit boilers. Mora Top is presented in three variations:

  • Line “Meteor”. These are double-circuit boilers of the flow type. The removal of combustion products is carried out forcibly, as well as the injection of combustion air. Models are equipped with a burner with a modulated flame.
  • “Titan” series. Conventional open combustion chamber. A chimney is required. Installed security sensors. Built-in “Antifreeze” mode: when the temperature drops to +5 degrees, heating is activated.
  • Sirius line. This is a complex technique. Here you will find single-circuit and double-circuit models, with an open and closed chamber. They consume electricity economically – no more than 1-2 kW.

In the event of a malfunction, an error code appears on the Mora Top display. Its value indicates the cause of the failure.

Mora gas boiler error codes

If you notice a code on the display, restart the equipment. Did the symbols light up on the screen again? Then start looking for the reasons for their appearance.

Malfunction codeValueReason of appearanceIndependent repair
E0The technique doesn’t work.
  • No gas supply.
  • The burner does not work.
  • The pump is not working.
  • Open the gas valve all the way.
  • Inspect the burner and its jets for blockage. Clean them with a brush.
  • Check the circulation pump. Replace element if damaged.
E1The boiler is not functioning. The switch does not close.Not enough water in the system:
  • The heating filter is clogged.
  • The circulation pump is broken.
  • Incorrect pump adjustment.
  • Accumulation of air in pipes.
  • Switch defective. Wiring problems.
What to do:
  • Clear filter.
  • Set pump to position 2 or 3. Repair.
  • Bleed air from the system using valves. Restart the product with the ON/OFF button.
  • Check wiring and replace switch.
Error E2Extinguishing the burner.
  • Problems with gas fittings, violation of supply.
  • Burner blockage.
  • Broken (displaced) ignition electrode.
  • The transformer has failed. Weakened contacts.
  • Wrong network connection.
  • Thrust sensor operation or its malfunction.
  • Boiler shutdown due to overheating.

Turn the gas cock. Then press RESET.

Diagnose and clean/replace:

  • Burners. Cleaning from soot and soot.
  • electrode. Install the part in place (3-4 mm from the burner).
  • Ignition transformer. Pull contacts.
  • Plugs in socket. Reverse its location.
  • Traction sensor. Inspect and clean the chimney.
  • Thermostat, its circuit and contacts.
E3The thermostat is open. Appliances do not work on hot water and heating.Incorrect operation of the heating temperature sensor.Monitoring the condition of the sensor wiring. Its connections to the control board. Installation of a working element
E4The DHW temperature sensor contacts are open.Actions are similar to E3.
E5Problems with the security module.
  • Overheating of the device.
  • Defective emergency thermostat.
  • Chimney flue blockage.
  • Pressure switch failure.
  • Violation of the tube connecting the pressure switch and the fan.
  • Failure of the fan to perform its functions.
  • Diagnostics of the thermostat, its circuit to the control unit.
  • Cleaning the chimney.
  • Installing a new switch, repairing the circuit, tightening the contacts.
  • Checking and replacing the tube.
  • Diagnostics of fan parts: motor, wheel bearing, its wiring to the main module.

The Mora Electra models are characterized by the following codes:

  • 01 – pressure reduction.
  • 02 – the system is overheating.
  • 03 – reserve.
  • 04 – thermostat defective.
  • 05 – EEPROM memory block does not work correctly.
  • 06 – RAM+RTC memory failure.
  • 07 – problems with management.

These problems are corrected by checking and repairing the components. There are other errors that indicate minor malfunctions:

  • 08 – the boiler is operating normally, everything is fine.
  • 09 – DHW temperature sensor is out of order.
  • 10 – External thermometer has failed.
  • 11 – cascade line broken.
  • 12 – the modem gives a bad signal.
  • 13 – the insulation of the heaters is damaged.

In case of minor breakdowns of Mora Proxima and other models, the ALM LED diode blinks on the panel at a frequency of 1 Hz. At the same time, the technique works, but with failures.

Serious faults are indicated by the permanent illumination of the yellow LED ALM. The heater does not work, all functions are disabled.

Other problems

During operation, there are malfunctions that are not displayed on the display; you will not find their description in the instructions. Therefore, we will tell you what to do in such a situation:

  • The control LED does not light up on the panelwhether. Make sure the part is receiving electricity. Install a working light bulb or switch.
  • The heater does not start. The ignition electrode does not work, the circuit is broken. Check tightness of contacts between electrode and VN output. If you hear sparking sounds when starting, you need to check the connection with the ignition and ground wire.
  • The burner works 50 seconds. Fuel supply problems. Diagnose the valve, remove the accumulated air.
  • The burner lights up and goes out. At the same time, “unlock” is lit. The diameter of the nozzles does not match the instructions. The gas supply is shut off. Clean or install new nozzles.
  • Relief valve prevents startingj. The diode on the panel lights up (insufficient heating). Add water to the system.
  • No DHW heating. The three way valve is broken. Replace it.
  • There is no heating in the boiler, which is connected to the boiler. Adjust the temperature, diagnose the temperature sensor, replace if there is a malfunction.
  • Smoke fuse blocking. Clean the chimney channel (sometimes gusts of wind interfere with normal operation). Remove the fuse lock by holding the TS button of the network module.

We hope our recommendations will help you restore the boiler and enjoy warmth and comfort again.

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