BoilerFaultCodes 01
Alternates with CH Temperature
Baxi Neta-tec Combi 33 GA Fault codes & diagnostics
30 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 2011-2015 Discontinued
GC Number 47-075-53
Download the Baxi Neta-tec Combi 33 GA manual
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The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 30 Unrated
Just want the most common Baxi Neta-tec Combi 33 GA faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 30 documented codes
Tap any card for details
02
Alternates with Outside Temperature
03
Alternates with DHW Temperature
04
Alternates with DHW Temperature / Flue Temperature
05
Alternates with System Water Pressure / Heat Exchanger Temperature
06
Alternates with Return Temperature
09
Gas Valve Connection Cable
15
Gas Valve Fault
20
Central Heating NTC Fault
28
Flue NTC Fault
Showing 11–20 of 30
40
Central Heating Return NTC Fault
55
Calibration Required
109
Pre-circulation Fault
110
Safety Thermostat Operated
117
Primary System Water Pressure Too High
118
Primary System Water Pressure Too Low
125
Circulation Fault (Primary)
128
Flame Failure
130
Flue NTC Operated
133
Interruption Of Gas Supply or Flame Failure
Showing 21–30 of 30
134
Elapsed Time - Gas Valve Open Without Gas
135
Interruption Of Gas Supply (Internal Error)
154
Flow/Return Sensor Temperature Test
160
Fan or Fan Wiring Fault
270
Circulation Fault (Dry Fire)
321
Hot Water NTC Fault
384
False Flame
E118
low water pressure
E128
air in the gas supply
E133
air in the gas supply