| CODE / | DESCRIPTION | CODE / | DESCRIPTION |
| 101 | Overheat | 303 | Main PCB error |
| 103 - 107 | Insufficient circulation | 304 | Too many (greater than 5) resets in 15 mins |
| 108 | Insufficient water (request filling) | 305 - 307 | Main PCB error |
| 109 | System pressure greater than 3 bar | 501 | No flame detected |
| 110 | CH flow temp probe open / short circuit | 502 | Flame detected with gas valve closed |
| 112 | CH return temp probe open / short circuit | 504 | Flame lift |
| 114 | External sensor open / short circuit | 5P1 | 1st ignition failed |
| 116 | Floor thermostat contact open | 5P2 | 2nd ignition failed |
| 1P1 - 1P3 | Insufficient circulation indication | 5P3 | Flame cut off |
| 201 | DHW temp probe open / short circuit | 604 | Insufficient fan speed |
| 203 | Incorrect appliance version setup | 610 | Thermal fuse open |
| 301 | EEPROM error | 612 | Fan error |
| 302 | Communication error |
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