Fault mode | 29
8 716 473 216 (2014/09)Gaz 6000 W
15.2 Faults that are shown on the display
Display code Description Remedy
A7 Temperature sensor for hot water is faulty. ▶ Check the temperature sensor and connecting lead for breaks or
short-circuits; replace them if required.
Ad Cylinder temperature sensor not detected. Check cylinder temperature sensor and connecting lead.
C1 Fan speed too low. ▶ Check power supply.
▶ Check flue gas system; clean or repair if required.
C4 The differential pressure switch will not respond if
the fan is switched off.
Check pressure switch and wiring, check connection hoses.
C6 Pressure switch not closing. Check fan lead and connector, check fan, replace as necessary.
Check pressure switch, sensor and connecting pipes.
C7 Fan not running. Check fan lead and connector, check fan, replace as necessary.
CE Filling pressure of the heating system is too low. ▶ Top up the system with water.
d7 Gas valve faulty. ▶ Check lead.
▶ Check gas train; replace if required.
E2 Flow temperature sensor faulty (lead break). Check the temperature sensor and connecting lead for breaks or short-
circuits.
E9 Temperature limiter for heating block has
responded.
▶ Check heat exchanger temperature limiter and lead for breaks;
replace if required.
▶ Check the operating pressure of the heating system.
▶ Check temperature limiter; replace if required.
▶ Check pump starter; replace pump if required.
▶ Check the fuse; replace if required ( page 7).
▶ Bleed the appliance.
▶ Check heating block on the water side; replace if required.
▶ Check flue gas temperature limiter and lead for breaks; replace if
required.
EA Flame not detected. ▶ Check earth lead is correctly connected.
▶ Check whether gas valve is open.
▶ Check gas supply pressure; correct if required.
▶ Check power supply.
▶ Check electrodes with lead; replace if required.
▶ Check flue gas system; clean or repair if required.
▶ Check gas settings; correct if required.
▶ For natural gas: Check external gas flow limiter; replace if required.
▶ For open flue operation, check air supply or ventilation apertures.
▶ Clean heat exchanger ( page 26).
▶ Check gas train; replace if required.
F7 A flame is detected although the appliance is
switched off.
▶ Check electrodes for contamination; replace if required.
▶ Check flue gas system; clean or repair if required.
▶ Check PCB for moisture; dry if required.
FA A flame is detected after the gas has been switched
off.
▶ Check gas train; replace if required.
▶ Check electrodes and lead; replace if required.
▶ Check flue gas system; clean or repair if required.
Fan stage not selected. ▶ Select fan stage.
P Appliance type not defined. ▶ Set appliance type ( service function 3.1.A).
Fd Key was held down for too long (over 30 secs). ▶ Press the key again for less than 30 secs.
Table 20
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