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Code | Description | Check, repair/replace as necessary |
A8 | EMS coms error | Check all electrical connections, replace control board. |
b1 | Code plug not detected | Insert code plug correctly, test and replace as necessary. |
b2,b3,b4, b5,b6 |
Data error | Replace control board. |
b7 | Burner control error | Replace control board. |
C6 | Fan defect | check fan, lead and connector. Replace as necessary |
d3 | External temp limiter | Connect terminals 8 & 9 on ST8. |
d5 | Condensate pump failure | see condensate pump table |
EA | Burner control lockout | Check gas is present, ignition electrodes and harness, flame sense electrode and harness, and operation of gas valve. Replace as necessary. |
E2 | Primary NTC defect | Check primary NTC sensor and leads, resistance across NTC should be between 36k to 1k Ω |
E9 | OH stat tripped | Check system pressure, overheat thermostat, and pump operation. Replace as necessary |
F0 | Internal error | Check all electrical connections, replace control board as necessary. |
F1 | ROM error check | Check all electrical connections, replace control board as necessary. |
F7 | Flame detected after appliance shut off | Check flame sense electrode and harness, and control board for signs of water damage. Replace as necessary |
FA | Flame detected after gas shut off | Check flame sense electrode and harness, and control board for signs of water damage. Check gas valve operation. Replace a s necessary |
Fd | Reset button pressed | press reset button again. |