Navien · A niche brand in the UK. 50 codes across 1 product family, each taken from the manufacturer’s manuals.
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Type the code on your display or a word from its meaning. Each code opens its own page with what it means, whether it is safe and what you can check.
50 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| E04 | Electric heater overheating protection | Not stated | Yes |
| E08 | Communication failure between the PCB and display | Yes | Yes |
| E11 | HP protection (HP switch is open) | Yes | Yes |
| E12 | LP protection (LP switch is open) | Yes | Yes |
| E19 | Primary antifreeze protection | Partly | Yes |
| E29 | Secondary antifreeze protection | Partly | Yes |
| E032 | Flow switch protection (flow switch is open) | Yes | Yes |
| E051 | Compressor overcurrent shutdown error | Yes | Yes |
| E065 | High water outlet temp. protection | Not stated | Yes |
| E081 | Communication failure between PCB and fan driver board | Yes | Yes |
| E103 | Fan motor overload protection | Yes | Yes |
| E171 | Anti-freeze protection | Partly | Yes |
| F01 | Compressor activation failure | Yes | Yes |
| F03 | PFC error | Yes | Yes |
| F05 | DC bus overvoltage | Yes | Yes |
| F06 | DC bus undervoltage | Yes | Yes |
| F07 | AC input undervoltage | Yes | Yes |
| F08 | AC input overcurrent | Yes | Yes |
| F09 | Input voltage sampling error | Yes | Yes |
| F10 | Communication failure between DSP and PFC | Yes | Yes |
| F11 | Communication error between DSP and communication board | Yes | Yes |
| F12 | Communication failure between the PCB and driver board | Yes | Yes |
| F13 | IPM overheating stop | Yes | Yes |
| F15 | Input voltage lacking phase | Yes | Yes |
| F16 | Compressor has weak magnetic protection alarm | Yes | Yes |
| F17 | Drive board temperature error | Not stated | Yes |
| F18 | IPM current sampling error | Yes | Yes |
| F20 | IGBT power device overheating alarm | Yes | Yes |
| F22 | AC input over current protection alarm | Yes | Yes |
| F23 | EEPROM fault alarm | Yes | Yes |
| F24 | Broken EEPROM activation ban alarm | Yes | Yes |
| F25 | LP 15V underload error | Yes | Yes |
| F26 | IGBT power device overheat error | Yes | Yes |
| F031 | DC fan motor 1 failure | Yes | Yes |
| F032 | DC fan motor 2 failure | Yes | Yes |
| P01 | Water inlet temp. sensor error | Partly | Yes |
| P02 | Water outlet temp. sensor error | Partly | Yes |
| P04 | Ambient temp. sensor error | Partly | Yes |
| P17 | Water outlet temp. sensor error (second outlet sensor) | Partly | Yes |
| P032 | Hot water tank temp. sensor error | Partly | Yes |
| P42 | Room temp. sensor error | Partly | Yes |
| P101 | EVI inlet temp. sensor error | Partly | Yes |
| P102 | EVI outlet temp. sensor error | Partly | Yes |
| P153 | Coil temp. sensor error | Partly | Yes |
| P181 | Exhaust temp. sensor error | Partly | Yes |
| P182 | Exhaust over temp. (exhaust temp >= C05, default 110 C) | Yes | Yes |
| P191 | Antifreeze temp. sensor error | Partly | Yes |
| Pp1 | Exhaust pressure sensor error | Partly | Yes |
| Pp2 | Suction pressure sensor error | Partly | Yes |
| TP | Low ambient temp. protection | Not stated | Yes |