Service Manual

Page 62
Display
Description
Solution
CA
Air in the water circuit (commissioning).
Water flow above maximum value
specified ( 9.24GPM).
▶ Disconnect the appliance and purge hydraulic circuit.1)
▶ Check that water pressure does not exceed 150 psi.
CF
C1
CE
- Vent blockage during operation (Flue
vent outlet or air vent inlet). Insufficient
combustion air.
- Air flow insufficient for start-up (Before
flame ignition).
- Flue outlet vent blockage (exhaust
pressure above siphon water column).
Excessive flue vent pressure.
▶ Remove blockage from the exhaust/intake vent.
▶ Check room air inlet requirements. See Chapter 4.7.
▶ Reset the appliance.
C3
Flow sensor does not detect water
recirculation.
Check pump and connections.
▶ Check recirculation circuit for any blockage.
E0
Internal Failure in ECU
Flow sensor does not detect water recirculation.
E1
Hot water temperature sensor detects
overheating (> 194 °F).
▶ Let the appliance cool down and try again.
▶ Check sensor resistance.
E3
Flue gas temperature sensor detects high
temperature (> 194 °F).
▶ Let the appliance cool down and try again.1)
▶ Check sensor resistance.
E4
Temperature inside the cabinet is above
194 °F.
▶ Check for flue gas leakage inside the cabinet.
▶ Let the appliance cool down and try again.1)
▶ Check sensor resistance.
E5
Copper heat exchanger gas temperature
sensor detects temperature above 392 °F,
the appliance is locked.
Descale appliance.
E7 Internal error
▶
To unlock, reset the appliance by touching the ON/OFF
button for 3 sec.
▶ If the problem persists replace ECU.
E8
Error during ionization test. ECU internal
error.
ECU may need to be replaced.
E9
Thermofuse open. Temperature above 237
°F.
Replace thermofuse cable.
EA
Flame not detected. Ionization loss 9
consecutive times.
▶ Check the gas supply pressure.
▶ To unlock, reset the appliance by touching the ON/OFF
button for 3 sec.
▶ If the problem persists check the ignition electrode or
the ionization electrode.
▶ Check Air/Gas flow adjustment.
EC
Partial ionization loss 5 times.
▶ Check the gas supply pressure.1)
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