Fault Finding - Baxi Platinum 2 Combi 28 GA Installation & Servicing Instructions Manual

Reset Function
When an error is displayed press the Selector Button
then rotate it until 'Yes' is displayed and press again.
Table Of Error Codes
20 Central Heating NTC Fault
Flue NTC Fault
28
40 Central Heating Return NTC Fault
109 Pre-circulation Fault (Air in Boiler - Temporary Fault)
Safety Thermostat Operated
110
117 Primary System Water Pressure Too High
118 Primary System Water Pressure Too Low
125 Circulation Fault (Primary)
Flame Failure - In Operation
128
130 Flue NTC Operated
133 Flame Failure - At Ignition (after 4 attempts)
151 PCB Internal Fault
154 Flow/Return Sensor Temperature Test
160 Fan or Fan Wiring Fault (Fan Not Running)
270 Circulation Fault (Dry Fire)
Hot Water NTC Fault
321
384 False Flame (Flame Without Demand)
385 Input Voltage Too Low
386 Fan Speed Not Achieved
48
© Baxi Heating UK Ltd 2011

19.0 Fault Finding

19.1 Initial Fault Finding Checks
1. Check that gas, water and electrical supplies are available
at the boiler.
2. Electrical supply = 230V ~ 50 Hz.
3. The preferred minimum gas pressure is 20 mbar.
4. Carry out electrical system checks, i.e. Earth Continuity,
Resistance to Earth, Short Circuit and Polarity with a suitable
meter.
NOTE: These checks must be repeated after any
servicing or fault finding.
7. Ensure all external controls are calling for heat and check
all external and internal fuses. Before any servicing or
replacement of parts, ensure the gas and electrical supplies
are isolated.
19.2 Error Codes
1. If a fault occurs on the boiler an error code may be shown
by the facia display.
2. The codes are a flashing number, either two or three digit,
preceded by the symbol :-
followed by 20, 28, 40, or 160 indicates possible faulty
components.
110 indicates overheat of the primary system water.
117 is displayed when the primary water pressure is greater
than 2.7 bar.
118 is displayed when the primary water pressure is less than
0.5 bar.
133 indicates that the gas supply has been interrupted,
ignition has failed or the flame has not been detected.
128 is displayed if there has been a flame failure during
normal operation.
125 is displayed in either of two situations:-
i) If between 15 and 30 seconds of the burner lighting the boiler
temperature has not changed by 1°C.
ii) If within 10 minutes of the burner lighting the boiler actual
temperature twice exceeds the selected temperature by 30°.
In these instances poor primary circulation is indicated.
3. By 'Resetting' when:-
110, 125, 133, 128 & 384 are displayed it is possible to
relight the boiler.
4. If this does not have any effect, or the codes are displayed
regularly further investigation is required.