Use and Care Manual

54
Code Error Code Description Possible Remedies
Er55 Stop Supply Inlet Water.
• If the water pressure is not rising supplement progress at
least 13 psi.
• Check supply water and inlet shut off valve. This valve must
be open.
• Check the auto feeder.
Er56 High Heating Water Pressure
• Water pressure higher than 50 psi.
• Check the pressure sensor.
• Contact technical support.
Er58 LWCO Abnormality
• Ensure the LWCO wiring connection on circuit board.
• Measuring output AC24V from terminal on circuit board in the
case of external LWCO install.
• Make-up water to the system if necessary.
• Contact technical support.
Er59 Pressure Sensor Abnormality
• Check the pressure sensor.
• Contact technical support.
Er61 RPM Sensor • Check fan motor.
Er63
Overheating Heating SupplyThermistor during
HeatingOperation (Exceed 205°F(96°C))
• Turn off the Combi Boiler for at least 30 minutes, and then
restart it.
• Clean the heating water return lter.
• Flush the primary heat exchanger.
Er65 Flow Control ValveAbnormality • Check ow control valve.
Er67 AGM Abnormality
• Try main power switch OFF/ON → Still the same Error Code
→ AGM failure.
Er72 Flame Detected before IgniteAbnormality
• Measure the current from the Flame Sensor when there is no
ame.
• To reset this error code, the power needs to be disconnected
and then reconnected.
Er73 DIP Switch Setting Abnormality • Check the DIP Switch settings.
Er76
Communication Error betweenControl Panel and
CircuitBoard.
• Check connections from Circuit Board to Control Panel.
• To reset this error code, the power needs to be disconnected
and then reconnected.
Er94
Overheating Exhaust Thermistor (The Combi
Boiler shuts down when the exhaust temperature
exceeds 149°F (65°C) for PVC vent or 200°F
(93°C) for CPVC vent.
• Turn off the Combi Boiler for at least 30 minutes, and then
restart it.
• Check the exhaust thermistor and related wiring.
• Make sure that the vent / air intake are properly installed.
• Flush the heat exchanger.
Table 22 – Error Codes with Linked Components, Effects, and Actions