Insufficient circulation | Water pressure |
| |
| Bleed heat exchanger |
| Pump operation |
| CH return filter for blockages |
| Circulation around boiler (blockages) |
| ntc temperature sensors |
Insufficient water (request filling) | Water pressure gauge for correct pressure |
| Check for waterleaks on the entire system |
CH Flow temp, probe circuit open/ short circuit | Check connections and wiring to temp sensors |
CH Flow temp, probe circuit open/ short circuit | Resistance values of temp sensors |
Heating delivery probe problem | Details in maintenance guide in installation manual |
Floor thermostat contact open | Check terminals TA2 for presence of link wire |
EEPROM Error | Check the EEPROM connection onto the pcb |
Communication error | Check connection and wiring onto all devices, main and display pcb |
Too many (>5) resets in 5 minutes | Identify reason for lockout from table and check for relevant faults |
No Flame detected | Insufficient working gas pressure |
1st Ignition failed | Spark electrode/wiring connectors |
2nd Ignition failed | Ignition electrode/wiring connectors |
Flame cut-off | Spark generator/wiring connectors |
| Check flue system for correct assembly/ termination |
| Check earth |
| Gas valve |
| C02 settings |
| Soft light rate |
Flame detected with gas valve closed | Ignition electrode/wiring connectors |
| Ignition electrode wiring connection onto main pcb |
Flame lift | Insufficient working gas pressure |
| Check flue system for correct assembly/ termination |
| C02 settings |
Thermofuse open | Check wiring and connections to thermofuse |
| Check integriry of main heat exchanger |
Fan speed error | Check fan |
| Check wiring connections from fan to pcb |