Baxi LUNA DUO-TEC Troubleshooting Manual
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Baxi LUNA DUO-TEC Troubleshooting Manual

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LUNA DUO-TEC

Troubleshooting

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Summary of Contents for Baxi LUNA DUO-TEC

  • Page 1: Troubleshooting

    LUNA DUO-TEC Troubleshooting...
  • Page 2 Baxi N.A. assumes absolutely no liability in the execution of the training suggestions in this document. Should you experience problems or complications beyond your realm of training, please...

  • Page 3: Table Of Contents

    ROUBLESHOOTING UIDE Table of Contents Section Page Controller Accessing Parameters Description of Parameter Error Code History Error Codes Multi Zone Relay Card Connection and Options PCB Replacement (without easy key service Memory stick) PCB Replacement (with easy key service) Combustion Adjustment Function (304) Manual Control Function (301) De-aeration Function (312) Replacement Parts...

  • Page 4: Controller

    ROUBLESHOOTING UIDE ONTROLLER YMBOLS Boiler Off – Heating and DHW disabled Burner on (Boiler frost protection is active) Domestic hot water mode Ignition Fault enabled Boiler/system water pressure low Central Heating mode enabled Error call for service Programming menu Resettable fault Boiler information menu Fault in progress Units of measure...

  • Page 5: Accessing Parameters

    ROUBLESHOOTING UIDE CCESSING ARAMETERS 1) Press both the buttons fro 6 seconds, the display shows “P01” alternating with its value (0); 2) Press either buttons to scroll the parameters list; 3) Press the button to edit the selected parameter; 4) Press either buttons to modify the parameter value ;...

  • Page 6: Description Of Parameter

    ROUBLESHOOTING UIDE FACTORY SETTINGS DESCRIPTION OF PARAMETERS LUNA DUO-TEC 1.33 GA 40 GA ------- Gas used Natural Gas = 00 Propane = 01 Hydraulic system 00 = instantaneous appliance 03 = instantaneous appliance with pre-heat function 05 = appliance with external storage boiler...
  • Page 7 ROUBLESHOOTING UIDE Maximum CH setpoint (°C) 00 = 176°F / 80°C - 01 = 113°F / 45°C Pump overrun time in heating mode (01-240 minutes) Burner ignition pause time in CH mode (00-10 minutes) - 00=10 seconds Manufacturer information Pump overrun time in DHW mode (seconds) Anti-legionellosis function 00 = Disabled 01 = Enabled...

  • Page 8: Error Code History

    RROR ISTORY The Baxi Luna Duo Tec PCB is able to store the last 10 errors that have occurred. The PCB is programmed with a counter which counts consecutive errors of the same error code. In order to view the error code history scroll to COO after P31 as described in the Accessing Parameters 1 –...

  • Page 9: Error Codes

    ROUBLESHOOTING UIDE Central Consecutive Number of heating Error error code days pasted System System temperature Parameters storage Error code counter of since the status phase at the time number the same error of the error error (00= today) in °C Errors with out reset Errors with...
  • Page 10 ROUBLESHOOTING UIDE Error Error Solution Code -Check connection at the gas valve and PCB Gas valve connection fault. -If both connections are good replace PCB Notes: -Disconnect the outdoor temperature sensor and Take an ohm reading refer to NTC sensor chart -Check the wiring to the outdoor temperature sensor looking for a break or short in the wire Outdoor sensor fault.
  • Page 11 ROUBLESHOOTING UIDE -Take an Ohm reading of the return NTC sensor refer to chart. The sensor should read within +/- 10% of the stated ohms on the NTC sensor chart, if out of calibration replace sensor. Return NTC sensor fault. - If the sensor is good, check the wiring harness for loose or broken wires - If the sensor and wiring are good replace the PCB Note:...
  • Page 12 -Follow the instructions PCB Replacement (with easy key service) in the troubleshooting guide or PCB not programmed. the instructions that re provided with the new PCB Note: -Check the wiring connection between the Baxi modulating room unit and the M2 bus terminal Communication problem 83-84-85- position 1 & 2...
  • Page 13 ROUBLESHOOTING UIDE -Check pump to make sure the impeller is spinning and not creased -Check for restrictions -Ensure that all air is out of the system Safety thermostat tripped - Ensure wiring to pump is not disconnected due to over temperature -Use a multi meter and ohm(Ω) test the high limit (0Ω...
  • Page 14 UO - ROUBLESHOOTING UIDE Check the flame sensor gap to the burner -Check the flame sensor for any damage or build up. If cleaning is required use an non-abrasive cloth -Check flame sensor wiring for a loose connection or broken wire Loss of flame.
  • Page 15 ROUBLESHOOTING UIDE -Check the thermo fuse, use a multi meter and check for resistance (OL indicates the sensor Thermo fuse tripped due to is broken and 0 Ω indicates its closed) over temperature. -Check the status of the primary exchanger. Replace the heat exchanger if necessary. Note: No Spark - Check Power, polarity and grounding to the unit...
  • Page 16 ROUBLESHOOTING UIDE - Check for proper polarity and grounding to the unit -Check for adequate gas pressure and flow to the unit refer to the installation manual Ignition failure -Check µA (micro-amps) reading from flame sensor. Should be 3-5µA Note: -Replace PCB Gas supply valve blocked.
  • Page 17 ROUBLESHOOTING UIDE -Ensure Fan connections correct at fan and PCB Connectors X11 & X23 Fan fault. -Is there 120V AC at fan terminals connector X11 blue to brown. If not replace PCB -ensure fan is not seized or sticking Note: 162/ Incorrect power supply -Ensure P 43 is set to 01...
  • Page 18 ROUBLESHOOTING UIDE - Check for proper polarity and grounding to the unit -Check venting for flue recirculation -Check wiring connections to the gas valve & PCB – X36 and X2 connector -Check the resistance of the coils: Pin 1 and 3 = 20 - 30 Ohm 164/ Fault flame (parasitic flame).

  • Page 19: Multi Zone Relay Card Connection And Options

    ROUBLESHOOTING UIDE ULTI ELAY ONNECTION AND PTIONS PTIONAL CCESSORY The multi zone relay card can be programmed for multiple outputs. The multi zone relay card connects to the PCB on the X34 connector. The multi zone relay card has two relay which are controlled by P04 (relay 1) and P05 (relay 2) parameters.

  • Page 20: Pcb Replacement (Without Easy Key Service Memory Stick)

    ROUBLESHOOTING UIDE PCB R EPLACEMENT WITHOUT EASY SERVICE MEMORY STICK The procedure is as follows: • Switch off the boiler and make sure the unit is unplugged • Remove the front panel and open the PCB plastic box cover • Remove the memory stick out of the pcb and move it in the new one •...

  • Page 21: Pcb Replacement (With Easy Key Service)

    ROUBLESHOOTING UIDE PCB R EPLACEMENT WITH EASY KEY SERVICE The procedure is as follows: • Switch off the boiler and make sure the unit is unplugged • Remove the front panel and open the pcb plastic box cover • Replace the easy key •...
  • Page 22 ROUBLESHOOTING UIDE 8) Press either button to scroll through the parameter list to parameter P22; 9) Press the button to edit the selected parameter and set P22 to 22; 10) Press the button to save the parameter value; 11) Press either button to scroll through the parameter list until parameter P73;...

  • Page 23: Combustion Adjustment Function (304)

    ROUBLESHOOTING UIDE (304) OMBUSTION DJUSTMENT UNCTION (In the event the CO2 value is out of range as describe in the manual section 12.4 Combustion adjustment function). To enable the function follow the sequence below: a) press together for about 6 seconds the b) when the function is active the display shows ‘On’...

  • Page 24: De-Aeration Function (312)

    ROUBLESHOOTING UIDE (312) AERATION UNCTION This function is used to facilitate the elimination of air inside the heating circuit when the boiler is first installed or after maintenance when the water is drained from the primary circuit. To enable the de-aeration function press buttons together for 6 seconds When the function is active, On appears on the display for a few seconds, followed by 312 The electronic board will activate the pump on/off cycle for 10 minutes.

  • Page 25: Pressure Table

    ROUBLESHOOTING UIDE NOTE: If the Calibration function doesn’t complete the cycle (the function remains at 100% for more than 10-12 minutes) press button to exit and set the parameter (Maximum fan speed) P71 to P71 - 15 and perform again the function. See section Parameters setting in the installation manual to change the parameter.

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