- L01 CLIMATE CONTROL NOT WORKING / UNDER NO CIRCUMSTANCES
- L02 CLIMATE CONTROL NOT WORKING / (NO AIR DELIVERY)
- L03 CLIMATE CONTROL AIR FLOW IRREGULAR
- L04 FAN' WILL NOT WORK AT DIFFERENT SPEEDS'
- L10 CLIMATE CONTROL NOT COOLING
- L11 CLIMATE CONTROL WORKING IRREGULARLY
- L12 CLIMATE CONTROL TOO COLD
- L15 CLIMATE CONTROL NOT HEATING
- L16 CLIMATE CONTROL RECIRCULATION NOT WORKING
- L30 SUPPLEMENTARY HEATER WILL NOT COME ON
- L31 BOILER OVERHEATING
- L32 EXCESSIVE SMOKINESS' AT EXHAUST TERMINAL
- L50 HEATER NOT WORKING / UNDER NO CIRCUMSTANCES
- L56 HEATER RECIRCULATION NOT WORKING