Baxi Neta-tec Combi GA Range Technical Manual

Neta-tec combi ga range, duo-tec 2 combi ga range, megaflo 2 system ga range gas fired wall mounted condensing combination & system boilers

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User's operating instructions & important warranty information (12 pages)

Installation & servicing instructions manual (32 pages)

Pocket technical manual (70 pages)

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Table of Contents

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Appliance Technical Guide

Service Engineer Edition

Neta-tec Combi GA Range

Duo-tec 2 Combi GA Range

Megaflo 2 System GA Range

Gas Fired Wall Mounted Condensing

Combination & System Boilers

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Colin Paterson

February 17, 2025

I have a Baxi Neta-Tec Combi GA Range,on the control panel the radiator symbol is flashing but cant find any information in the manual?

Summary of Contents for Baxi Neta-tec Combi GA Range

Page 1 Appliance Technical Guide Service Engineer Edition Neta-tec Combi GA Range Duo-tec 2 Combi GA Range Megaflo 2 System GA Range Gas Fired Wall Mounted Condensing Combination & System Boilers © Baxi Heating UK Ltd 2012...
Page 2: Table Of Contents
19.0 E133 Flow Chart displayed on System 20.0 Commissiong Procedure & Errors models the boiler will not operate. Press the 21.0 Additional Information button until the symbol appears. 22.0 Pages for Notes © Baxi Heating UK Ltd 2012...
Page 3: Gas Adaptive System
1.0 Gas Adaptive System The Gas Adaptive System The Baxi GA range of boilers are fully ‘Gas Adaptive’. This means the system automatically monitors the flame and adjusts the gas valve to achieve the correct combustion at all times. Explanation of Set Flames on GA The Set Flame is a value that is used to achieve the desired combustion and is set at either during manufacture or by an engineer on site.
Page 4: Combi C.h. Sequence Of Operation
Gas Valve Opens Spark 5 Attempts - E133 No Ignition Ignition Ignition Reset Achieved Flame On 12 Attempts - 5 Seconds Loss of Ignition Flame Stabilization Flame Stabilization Achieved E128 Full C.H. Rate Boiler Operating Reset © Baxi Heating UK Ltd 2012...
Page 5: Combi D.h.w Sequence Of Operation
Gas Valve Opens Spark 5 Attempts - E133 No Ignition Ignition Ignition Reset Achieved Flame On 12 Attempts - 5 Seconds Loss of Ignition Flame Stabilization Stabilization Flame Achieved E128 Full D.H.W Rate Boiler Operating Reset © Baxi Heating UK Ltd 2012...
Page 6: System C.h. Sequence Of Operation
Gas Valve Opens Spark 5 Attempts - E133 No Ignition Ignition Reset Ignition Achieved Flame On 12 Attempts - 5 Seconds Loss of Ignition Stabilization Flame Flame Stabilization Achieved E128 Full Rate Boiler Operating Reset © Baxi Heating UK Ltd 2012...
Page 7: Commissioning Function
When there is an error present (e.g. Low Water Pressure – E118) it must be rectified before the CF can be started or completed. If there is an interruption to CF it will start again. If de-aeration has been completed, it will start from gas type check. © Baxi Heating UK Ltd 2012...
Page 8 • The display will show ‘312’ and the De-aeration function activated. • It will be active for 10 minutes. • To disable, either press and hold the ‘ip’ and ‘CH -ve’ for 6 seconds or isolate the power to the boiler. © Baxi Heating UK Ltd 2012...
Page 9: Service Due Function
6….24 = months elapsed before ‘Sd’ is displayed. 25 = function disabled. • Choose the desired value and press the ‘ip’ button to confirm. • Press the reset button ‘R’ to exit the ‘TSP’ menu. © Baxi Heating UK Ltd 2012...
Page 10: Checking The Combustion
• Once the combustion has been changed, press the ‘ip’ button to toggle back to the fan speed and now, by pressing the ‘CH +ve’ or ‘CH -ve’, the fan speed can be changed. • Once completed press and hold the ‘ip’ and ‘CH +ve’ buttons for 6 seconds to de-activate Function 304. © Baxi Heating UK Ltd 2012...
Page 11: Combustion Re-Calibration
85 °. Check the gas inlet pressure has not dropped below 16mb. To G.V. Inlet The boiler will remain at ‘100’ until Test Point stabilization is achieved - up to 3 minutes. © Baxi Heating UK Ltd 2012...
Page 12 INSERT THE ANALYSER PROBE INTO THE FLUE SAMPLING POINT Pressing the ‘CH -ve’ or ‘CH +ve’ buttons changes the Set Flame value. Increasing the value weakens To Flue combustion, decreasing it makes the Sampling Point combustion richer. © Baxi Heating UK Ltd 2012...
Page 13 Once combustion has been checked, adjusted where necessary, and the readings recorded at each fan speed To Flue press reset ‘R’ button to escape the Sampling Point calibration function - ‘ESC’ will be displayed. © Baxi Heating UK Ltd 2012...
Page 14 * ‘33’ is typical a value °C Once the recirculation check is complete, either press the ‘ip’ and ‘CH +ve’ buttons for 6 seconds or isolate the power at the used spur and then re-instate it. © Baxi Heating UK Ltd 2012...
Page 15: Gas Type Selection
N.G. = 9.0% CO2 +/-0.2% L.P.G. = 10.5% CO2 +/-0.2% Note: The tolerance of +/-0.2% is for setting puposes - a tolerance of +/-0.8% can be applied when checking. The combustion is the same at each fan speed. © Baxi Heating UK Ltd 2012...
Page 16: Information Menu
15: Not used i 16 : Not used i 17: Fan Speed RPM i 18: num ic This function operates for 3 minutes, or can be cancelled by pressing the reset ‘R’ button. © Baxi Heating UK Ltd 2012...
Page 17: Error History
Ignition Load purging between 1st and 2nd attempt Ignition load 1st attempt Operation Active Lock Out 2nd Ignition Attempt Ignition Load purging between 2nd and 3rd attempt 3rd Ignition attempt Post Purging Function Overheating Post Purging function © Baxi Heating UK Ltd 2012...
Page 18 For example:- P32...C01...P32...E06...P32...02...P32...000...P32...03...P32...05...P32...75°C. The ‘C’ value is always the start of the sequence. Error Table for Engineers Table for recording errors:- Error Error Days System Phase C.H. Counter Number Code Elapsed Status Status Flow 75°C © Baxi Heating UK Ltd 2012...
Page 19: Errors & Sub-Codes
Failed the self check test during Calibration Function. Check for re-circulation before changing Gas Valve E109 Precirculation alarm Check for correct circulation of water and pump Note: (s.c.) = Short Circuit (o.c.) = Open Circuit © Baxi Heating UK Ltd 2012...
Page 20 Check the correct circulation of the water and the pump. E431 Aluminium sensor fault (s.c.). Check the sensor. E431 Aluminium sensor fault (o.c.). Check the sensor. Note: (s.c.) = Short Circuit (o.c.) = Open Circuit © Baxi Heating UK Ltd 2012...
Page 21: R.d.s
If the R.D.S. is damaged and a new one fitted then a Calibration is required (go to page 11) to calibrate the system. Calibration Not P.C.B. Changed Required P.C.B. & R.D.S. Changed Calibration Required R.D.S. Changed © Baxi Heating UK Ltd 2012...
Page 22: Electronic Gas Valve
The distance should be 5mm +- 1mm. If it is out of this tolerance, the combustion may be compromised by the settings of the E.G.V. so install a new electrode and perform a re-calibration as described on page 11. © Baxi Heating UK Ltd 2012...
Page 23: Hydraulics
• The pump is 2 speed operational. In D.H.W. it operates only at Max speed. In C.H. it switches between the two speeds depending upon temperature loadings to maintain the boiler in condensing mode. © Baxi Heating UK Ltd 2012...
Page 24 • The capillary pressure gauge connection is on the flow assembly above the D.H.W. sensor position • The Pressure Vessel connection is on the return assembly above the drain point • The bypass is integral and utilises the plate heat exchanger © Baxi Heating UK Ltd 2012...
Page 25 The Megaflo 2 GA hydraulics are of a composite construction. Key components are the same as the Neta-tec Combi GA and the connection points for the pressure gauge and pressure vessel are the same. © Baxi Heating UK Ltd 2012...
Page 26: Internal Wiring
Pressure Heating Switch Return Safety Sensor Heating Thermostat Flow Sensor Sensor From X20 & X31 g br br bk Terminal Strip To M2 Connection Flame Spark Sensing Ignition Electrode Electrode Pump Diverter Valve Motor © Baxi Heating UK Ltd 2012...
Page 27 Pressure Heating Switch Return Safety Sensor Heating Thermostat Flow Sensor From X20 & X31 Sensor g br br bk Terminal Strip To M2 Connection Flame Sensing Electrode Spark Ignition Electrode Pump Diverter Valve Motor © Baxi Heating UK Ltd 2012...
Page 28 Low Voltage Flue Sensor Hydraulic External Control Pressure Safety Connection Heating Switch Thermostat Return Sensor Heating Flow Sensor g br br bk Terminal Strip To M2 Connection Flame Sensing Electrode Spark Ignition Electrode Pump © Baxi Heating UK Ltd 2012...
Page 29: Electrical Measurements
A further check can be made using the Information Menu as described on page 16. Even if the boiler is not operating the temperatures can still be read in the Information Menu making it possible to check if a sensor is reading correctly. © Baxi Heating UK Ltd 2012...
Page 33: Additional Information
These values will closely achieve 9.0% CO2 at all speeds, which is the recommended combustion setting. If the value differs by more than 10 from those above and the CO2 is not changing it is possible that re-circulation is occurring or there is an outside influence affecting the combustion. © Baxi Heating UK Ltd 2012...
Page 36 All goods are sold subject to our standard Conditions of Sale which are available on request. Comp No. 7210507-01 (5/12) © Baxi Heating UK Ltd 2012...

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