Why errors appear on Protherm gas boilers and what they mean

Many Protherm heating boilers are equipped with self-diagnosis systems. During operation of the device, the electronic control unit receives information from several sensors that control the main operating parameters (temperature and pressure in different circuits, water flow, fan and pump impeller rotation speed, voltage in electrical circuits, etc.). Electronics ensures that the signals from the sensors fit within the allowable ranges. When the signal is missing, out of range, or looks unreliable, the Protherm boiler issues an error message. In this case, the error code appears on the equipment display. Knowing the code, you can determine why the Protherm boiler does not heat up and what needs to be done to put it in order.

Error codes for Protherm Lynx and Protherm Jaguar boilers

Wall-mounted gas boilers Protherm Lynx(Lynx series) and Protherm Jaguar (Jaguar series) are relatively simple equipment (compared to later generations of heaters of the same brand). Despite this, they also have internal diagnostic systems that can determine the main malfunctions and malfunctions.

Control panel for Protherm Lynx and Protherm Jaguar boilers.

The table below shows all the error codes that may appear on the information display of the Protherm Lynx or Protherm Jaguar boiler. Please note: for heating equipment of this brand, the error code traditionally begins with the letter F. But due to the fact that the screens of the Protherm Lynx and Protherm Jaguar boilers can only display two characters, it cannot be seen on the display. However, in the technical documentation, symbols with the letter F are used, and when communicating with service masters, error codes should be called in this form.

Display The code Decryption
F01 Overheat.
The temperature in the heating circuit exceeds 98 °C. Check if the valves on the radiators are open.
F02 Incorrect operation of the hot water temperature sensor.
Sensor check required. In the meantime, the boiler can continue to work, relying on the readings of the temperature sensor of the heating circuit.
F03 Incorrect operation of the water flow sensor.
It is necessary to check the flow sensor in the heating circuit and the wire with which it is connected.
F04 The flame was not detected.
The ionization sensor does not detect the presence of a flame in the burner. It is necessary to check the sensor, the ignition electrode and their cables. Perhaps the gas is blocked, or its pressure is lower than required.
F05 No air flow.
The boiler does not receive air in the volume necessary for normal operation. The flue must be checked. An error can also appear if the fan rotates too slowly due to contamination, blockage or low mains voltage (less than 165 V).
F06 Incorrect operation of the flow sensor.
The water flow sensor in the heating return circuit is defective or not working. Check it out.
F07 Faulty gas fittings.
The gas valve actuator is faulty or not working properly. Verification required.
F08 Overheat.
The temperature sensor installed in the supply line recorded a temperature of 95 °C or higher. The boiler is stopped to avoid damage.
F09 Incorrect operation of the pressure switch.
The contact of the pneumatic pressure switch does not work when the boiler is turned on. Turn off the power to the equipment and turn it on again.
F10 The pressure in the heating circuit is not normal.
The sensor indicates that the pressure in the heating circuit is below 0.3 bar or above 2.7 bar (normal value is between 1 and 2 bar). It is required to check the sensor and fill the system with water to normal pressure.
F11 Circulation failure.
The temperature difference in the supply and return heating circuits exceeds 35 °C. This error can have many causes, qualified diagnostics is required.
F12 Too low voltage.
The voltage in the mains has dropped below 165 V, with this value the correct operation of the boiler is impossible.
F13 Incorrect operation of the temperature sensor.
The temperature sensor in the supply line is faulty, does not work or shows a value indicating incorrect operation of the boiler (the temperature in the return line is 7 °C higher than the temperature in the supply line and remains so for at least 20 seconds).
Ab Auto-lock.
The auto-lock message appears once a day for a few seconds. It means automatic prevention (the boiler turns the three-way valve so that it does not turn sour). Prevention is accompanied by a hum inside the boiler, which is the norm.

Error codes for other heating gas boilers Protherm

In the latest generations of Protherm brand heating equipment, an “end-to-end” error designation system is used, common to several families of devices. Therefore, the errors of wall-mounted gas boilers Protherm Panther(Panther series) and Protherm Gepard(Gepard series), condensing boilers Protherm Puma Condens("Puma Condens") and Protherm Lynx Condens("Lynx Condens"), as well as floor-standing boilers Protherm Medved Condens("Bear Condens") match almost completely. The tables below decipher the error codes of devices from these families of Proterm equipment.

Boiler control panel Protherm Panther.

The first part of the table is devoted to error codes that arise due to problems with sensors that monitor the most important operating parameters. These problems are usually associated with a malfunction or complete inoperability of the sensor, lack of contacts on the terminals, short circuit, wire breakage or damage to their insulation. The algorithm of actions in case of errors F.00 - F.16 is the same: it is necessary to check the sensor, as well as the plug connections (or terminals) and the wiring harness with which it is connected to the electronic control unit.

Display The code Decryption
F.00 No signal from supply line temperature sensor.
F.01 No signal from return temperature sensor.
F.02 No signal from the hot water temperature sensor.
F.03 There is no signal from the water temperature sensor in the tank.
F.05 No signal from the external flue gas sensor.
F.06 No signal from internal flue gas sensor.
F.10 Short circuit of the supply line temperature sensor.
F.11 Short circuit of the temperature sensor in the return circuit.
F.12 Short circuit of the hot water temperature sensor.
F.13 Short circuit of the water temperature sensor in the tank.
F.15 Short circuit of the external flue gas sensor.
F.16 Short circuit of the internal flue gas sensor.

The next block of errors is devoted to malfunctions that cause the Protherm boiler to automatically stop due to the operation of fuses or limiters. Errors with codes F.20 - F.42 mean quite serious malfunctions that significantly affect the performance of the equipment and the safety of its operation.

Display The code Decryption
F.20 Temperature limiter triggered.
Heat flow sensors in the supply or return circuit detect overheating. The error may be due to a malfunction of the sensor or insufficient circulation of the coolant (due to a breakdown of the pump, blockage of the circuit or clogging of the main filter).
F.22 Insufficient amount of water.
The error appears due to damage to the sensor or a drop in water pressure. You should check the system for leaks, make sure that the sensor is working and add water if necessary.
F.23 Too much temperature difference.
The difference in readings between the temperature sensors of the flow and return lines exceeds 35 °C. Most likely, the pump is not functioning or is running at reduced capacity due to blockage by dirt particles or due to air entering the system. It also happens that the sensors are reversed.
F.24 Temperature rise too fast.
The temperature in the heating circuit rises by 10 °C per second or faster. The problem is usually that the pump is faulty, not working, or not set up correctly.
F.25 Flue gas temperature too high.
The flue gas temperature limiter does not work. Check the limiter, as well as its plug and wires. The error may appear due to incorrect installation of the boiler (for example, too close to the gas stove) or excessive equipment power for this heating circuit.
F.26 Problems with the gas valve.
The gas pressure regulator does not work due to a broken wire, lack of contact at the terminals, or a malfunction of the valve itself.
F.27 The gas is off, but a flame is detected.
The sensor "sees" the flame even though the gas valve is closed. The gas fittings (it can pass gas), the ionization electrode and the control board are subject to verification.
F.28 The flame was not detected.
Unable to ignite the flame. The reasons may be the lack of gas or its too low pressure, the ingress of air into the gas line, malfunctions of the gas fittings or malfunctions in the ignition system (which consists of an electrode, a connecting cable and a transformer).
F.29 The flame went out.
The error appears due to problems with the gas supply (valve closed, gas fittings faulty, low pressure in the line, air entering the gas), malfunctions of the ignition system, or excessive contamination of the burner nozzles with combustion products.
F.32 Fan error.
The fan is blocked, defective or has poor contact. Check plug and wiring. Problems may also be a malfunction of the Hall sensor or control board.
F.33 Pressure switch error.
Due to insufficient pressure, the pressure switch contacts do not close. The error may be due to a malfunction of the relay or fan. Air supply and flue gas removal systems are also subject to inspection.
F.36 Flue gas leakage.
It is necessary to check the pipes for supplying air and removing flue gases, as well as the fan of the exhaust system.
F.37 Increased fan speed.
Due to problems in the air duct or smoke exhaust system, the fan has entered emergency operation, its speed exceeds the permissible rotation speed.
F.42 Coding resistor error.
The resistor encoding the power value is defective or does not match the type of boiler. The electronic board may need to be replaced.

Boiler control panel Protherm Puma Condens.

Faults in Protherm boilers due to hot and cold water sensors are indicated by codes from F.45 to F.48. They appear due to breaks, short circuits or unreliable contacts. To fix them, it is usually necessary to check the sensor and wiring, damaged or non-functioning elements should be replaced.

Display The code Decryption
F.45 No signal from cold water sensor.
F.46 Short circuit of the cold water sensor.
F.47 No signal from hot water sensor.
F.48 Short circuit of the hot water sensor.

A large group of errors that occur during the operation of Protherm wall-mounted and floor-standing gas boilers are the result of malfunctions in the operation of electronic and electrical systems, as well as measuring instruments that are part of the design of heating equipment. The table below provides a breakdown of the codes for such errors.

Display The code Decryption
F.49 eBUS bus error.
The voltage at the eBUS terminals is not correct (15 - 24 V). The reason may be a broken wire, short circuit or power surges.
F.50 Gauge switch error.
The smoke exhaust system is clogged. It is also possible to block the condensate drain due to clogging or improper installation of the siphon.
F.51 The flue gas sensor detects leakage.
The temperature of flue gases is higher than allowed, leakage is possible. The flue system should be checked to ensure that there is an uninterrupted supply of fresh air to the boiler.
F.61 Gas valve drive failure.
It is required to check the gas fittings and the bundle of wires leading to it. There may be a malfunction of the control unit, requiring the replacement of the board.
F.62 No connection to gas valve.
The gas valve control circuit is open. Problems may be a malfunction of the gas valve or a defect in the electronic board.
F.63 EEPROM error.
The board is defective and needs to be replaced.
F.64 Electronics or thermistor error.
The temperature sensor or electronic board needs to be replaced.
F.65 Electronics overheating.
Excessive heating of the control unit due to malfunction or external influences. Make sure that the boiler is not heated by direct sunlight or from any heating devices and heaters (gas stove, radiator, etc.).
F.67 No signal from the ionization sensor.
The signal from the flame sensor is missing or out of range (0 - 5 V). The sensor or electronic control board may need to be replaced.
F.68 The flame is unstable.
The error appears if the pressure in the gas pipeline is too low or there is air in it, the flue gas exhaust system is faulty or the condensate drain pipe is clogged.
F.70 Invalid device code.
In the “brains” of the boiler, an invalid power value of the device is programmed, which does not allow determining its type and model. The error occurs as a result of replacing the board. Reconfiguration required.

Boiler control panel Protherm Lynx Condens.

In the table of errors for Protherm gas-fired hot water and heating boilers, a whole block is devoted to problems associated with temperature and pressure sensors, as well as control devices. Most often, they mean that a sensor is not responding, not giving a signal, or showing invalid data (that is so out of range that it looks unrealistic). If such errors do not disappear after restarting the boiler, then the intervention of a service technician is required, who will diagnose and determine whether the problem is in the sensor or in the electronic board of the control unit. When these errors occur, most often the replacement of defective parts is required.

Display The code Decryption
F.71 Feed line temperature sensor error.
F.72 Error in the temperature sensor of the supply and (or) return circuit.
F.73 The water pressure sensor shows too low a value.
F.74 The water pressure sensor shows too high a value.
F.75 Pressure sensor error when starting the pump.
F.76 Faulty thermal fuse on the primary heat exchanger.
F.77 Error in external equipment (flue gas valve, air supply damper or condensate pump).
F.78 No signal from the hot water temperature sensor on the external controller.
F.80 Inlet sensor SHE error.
F.81 Circulation pump error.
F.83 Error in changing the temperature of the supply and (or) return line sensors.
F.84 Error in the temperature difference between the flow and return sensors.
F.85 Flow and return sensors installed incorrectly or reversed.
F.86 Protection trip due to overheating of one of the circuits.
F.87 Ignition electrode error.
F.88 Gas valve error.
F.89 Pump error.
F.90 No communication with storage module.
F.91 Sensor error on drive module.
F.707 There is no communication between the electronic board and the boiler control panel.
Err
connection

What to do if the Protherm boiler knocks out an error

The operating instructions for Protherm gas boilers imply that if errors occur (except for those that are “cured” by rebooting the equipment), in the vast majority of cases, you should contact certified specialists who service appliances of this brand. Only a small part of the errors (for example, F.28, F.33 and several others) require the user to troubleshoot independently (we are talking about malfunctions that can be fixed simply by opening a tap, valve or damper). Check your boiler's instruction manual (namely the Troubleshooting section) to find out what problems you can fix yourself.

How to get rid of constant errors on the Protherm boiler

It should be noted that Protherm boilers often knock out errors not due to their own malfunctions, but due to problems with the electrical network. Voltage surges and dips cause sensors to malfunction, trip, or show incorrect data. The electronics recognizes these failures as boiler malfunctions and turns off the equipment. The operating experience of devices of this brand shows that Protherm boilers work better and turn off less often due to errors if the equipment is connected to the network not directly, but through a voltage stabilizer or UPS.