Proterm heaters are equipped with a self-diagnosis system. Due to this, errors in the operation of the Leopard boiler are displayed in the form of codes on the display. Their decoding will help determine the location of the problem in order to quickly restore the device to working capacity.
The device has a cast-iron base, which gives a high efficiency of 90-92%. A double-circuit gas boiler works simultaneously for heating and hot water supply (DHW). The design is equipped with a bithermic heat exchanger of the “pipe in pipe” type. Water circulates through the outer tube for the heating system, and through the inner tube for hot water.
Built-in mode “Winter-Summer” allows you to save on fuel consumption. The boiler can run on gas from the main or from a cylinder. The combustion chamber is open and closed.
Usually the manufacturer indicates the meaning of the faults in the instruction manual. But not everyone understands the technical language, moreover, the user manual may be lost. Therefore, we provide transcripts in the table.
- Increase the pressure by opening the make-up valve;
- Inspect connections and pipes for leaks. If there is a gap, seal it;
- Diagnose the pressure sensor and expansion tank.
F1/ F29 The flame has gone out. Lightning light flashes. Fuel supply cut off:
- Open the gas valve;
- Take a look at the pressure gauge. Make sure that the gas pressure in the line is normal;
- Restart the boiler
- Reconnect the plug to the socket;
- Run fan diagnostics.
F2 The water sensor in the heating system is out of order. Measure the resistance of the sensor, inspect the integrity of the wiring, tighten the connections. F3 The device has overheated. What to do:
- Clear the clogged filter mesh, pump;
- Remove scale from the heat exchanger;
- Check if antifreeze is suitable for your system. If not, change fluid.
F4 DHW temperature sensor not working. The lightning diode blinks. Tighten the contacts from the sensor to the electronic board. Replace defective element. F5 External temperature sensor is defective. If it is not present, the system gives a signal about power outages.
- Run diagnostics on the part. Install a new element;
- Install a voltage stabilizer if frequent power surges occur. The control and display panels may not be compatible.
F6 Failure of the differential relay, fan, draft sensor. Check:
- Sensor and relay connections to the control board;
- Serviceability of parts, fuel valve, fuse;
- Overheating sensor;
- Make sure there is no short circuit to the chassis.
F7 Communication problems. No contact between LCD and electronic module.
- Reboot the equipment;
- Inspect the wires between the module and the display. Measure the circuit for a short, open;
- Flip the plug in the socket;
- Turn on the drink. The indicators should be 1-2 Bar.
F8 Fuel supply valve failure. Diagnosis of wiring, valve coils. F9 Settings failed. Reconfigure the metrics. F10 Short circuit (short circuit) of the supply temperature sensor. Testing with a multimeter, installing a new part. F11 Short circuit of the NTC controller on the return line. F12/F13 Short circuit NTC hot water heater. F14 Collector NTC shorted. F15 Short circuit NTC exhaust gases. F16 Short circuit NTC thrust. F17 Short circuit NTC manifold return. F18 Short circuit NTC water heater ground. F19 Short circuit NTC hood. F20 The thermal fuse has tripped. Reduce the temperature in the circuit, inspect the fuse. F21 Blocking the device due to an increase in the set values. Contact the service center. F22 Too little water in the system.
- Unblocking, replacement of the pump;
- Turning on the make-up to the nominal level.
F23/F72 Insufficient fluid. Thermosensors on both lines give different readings. Make sure the sensors are working. F24 Coolant quantity reduced. The temperature is rising too fast. Same as F22. F25 Too hot water flows when opening the tap. Adjust the settings on the thermostat. F26 The current of the valve winding is not correct. Call the experts. F27 Burner flame signaled, although no fuel is supplied. Diagnostics and replacement of the ionization electrode. Inspection of contacts, wiring. F28 First ignition attempt failed. Try again. F30 Blocking sensor contacts open. Repair the chain, put a working element. F31 Short circuit of the blocking sensor. F32/F33 Anti-freeze mode enabled. The fan does not rotate correctly. Adjust the fan rotation, turn off the mode in the warm season. F35 Poorly exhausted products of combustion. Clean up:
- Pipes from the body to the chimney;
- Chimney shafts from soot, debris, foreign objects;
- Make sure there is normal traction. Without this, the boiler must not be turned on.
F36 Traction detection. For products with an open combustion chamber. Light a match and bring it to the control window. In the presence of thrust, the flame will deviate to the side. Otherwise, it will burn evenly. F37 Fan blades are rotating abnormally. Connection diagnostics. F38 Measurement frequency out of specification. Master’s call. F39 Error in self-diagnosis. F41 Fuel supply adjusted incorrectly. Change your settings. F42 Coding resistor failure. Checking the state of an element. F43 Vehicle model is identified incorrectly. Service call. F49 Low voltage on the eBus. F55 Problems with the CO sensor. F58 No contact with preheater. F60 Fuel valve control problems + F61 Problems with gas valve regulation – F62 Valve does not work. F63 EEPROM malfunction. F64 AOC error. F65 Electronic parts are overheating. F66 The IIC bus is not working properly. F67 Flame presence error. F70 OSN problems. F71 Opening of the water flow sensor. Tighten connections. F73 Bad pressure sensor connection. F74 Pressure controller wiring problem. Loop replacement. F75 The pump is on but the pressure is not rising. System restart. F76 The thermal fuse on the primary heatsink has blown. Installing a good fuse. F80 SHE error. Seek help from a specialist. F81 Malfunction of the circulation pump. F82 Problems with the anode tester. F90 No connection to the APC module. F91 The sensor on the APC module is faulty.
Users sometimes complain that the Leopard boiler hums and makes noise during operation. Check the heat exchanger for scale. If the tubes are overgrown with plaque, clean them. For this, a reagent pump is used. The system is pumped, then washed with clean water.
At the first sign of a problem, do not delay the repair. Inspect the equipment, find the cause of the breakdown. Sometimes it’s just the wrong settings, then you should follow the instructions. If you smell gas in the room, quickly turn off the valve and contact the gas service.