NOTE: When instructed to operate the reset button, press and hold for 5 seconds to reset the boiler.

Table Of Error Codes

E20 Central Heating NTC Fault

E28 Incorrect PCBFitted

E50 Hot Water NTC Fault

E110 Safety Thermostat or Condensate Safety Float Switch Operated

E125 Circulation Fault (Primary Circuit)

E131 Interruption Of Power Supply while in fault mode

E133 Interruption Of Gas Supply or Flame Failure

E155 Lock Out of Boiler Control

E158 Condensate Discharge System Fault

E160 Fan or Fan Wiring Fault

Service Reset

To perform a Service Reset it is necessary to have access to the boiler. By pressing the Reset rocker switch on the right of the boiler case for a minimum of 5 seconds when error codes are displayed it is possible to reset the boiler once the fault has been rectified.

Restoring Boiler Control Default

Following a Service Reset it is necessary to restore the Boiler Control to default condition:-

Disconnect the main power supply

On reinstating the power supply the Boiler Control display will count down from 7.

Before the count reaches 3 press both the ‘On/Off’ and ‘Reset’ buttons simultaneously and hold until the count reaches 0.

The Boiler Control display will show ‘SEt’ to confirm default restoration.

12.0Fault Finding

12.1Initial Fault Finding Checks

1.Check that gas, water and electrical supplies are available at the boiler.

2.Electrical supply = 230V ~ 50 Hz. Check the CH &DHW system. The preferred minimum gas pressure is 20 mbar.

3.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.

4.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.

12.2Error Codes

1.If a fault occurs on the boiler an error code may be shown on the boiler display and the Boiler Control.

2.The codes are either two or three digit, preceded by the letter 'E'. For example, code E133 will be displayed by 'E1' alternating with '33'. E20 is shown as 'E' then '20'

E20 & E28 indicate faulty or incorrect components.

E110 shows overheat of the primary water or excess condensate in the sump.

E125 is displayed if within 2 hours of the burner lighting the boiler temperature twice exceeds the selected temperature by 25°.

In these instances poor primary circulation or no water in the system is indicated.

E133 indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detected.

E155 indicates a Boiler Control reset when Service &Boiler Control reset counters are out of step. Boiler Control default not restored correctly.

E158 indicates a condensate discharge system fault.

3.By pressing the 'Reset' button on the Boiler Control for a minimum of 5 seconds when E110 & E133 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. It is possible to reset the boiler up to 4 times in any 5 hour period. Further resets via the Boiler Control are then blocked for 5 hours unless a Service Reset is performed.

34© Baxi Heating UK Ltd 2009

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Baxi Potterton BBU 15 HE manual Initial Fault Finding Checks, Error Codes
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BBU 15 HE specifications

The Baxi Potterton BBU 15 HE is a high-efficiency boiler designed to offer exceptional performance for both heating and hot water needs in residential settings. Known for its robust build quality and user-friendly features, this model is particularly favored for its versatility and reliability in various home environments.

One of the standout features of the Baxi Potterton BBU 15 HE is its compact size, making it suitable for installation in smaller spaces. Despite its small footprint, it delivers impressive outputs, making it ideal for homes with moderate heating demands. The boiler’s high efficiency rating ensures reduced energy consumption, leading to lower utility bills and a smaller carbon footprint.

Equipped with a powerful heat exchanger, the BBU 15 HE maximizes heat transfer, ensuring that households receive optimum warmth and hot water. With an output capacity of 15 kW, it can effectively heat a variety of living spaces while providing hot water on demand, making it a practical choice for families.

The boiler incorporates a number of advanced technologies that enhance its performance. One such feature is the built-in frost protection, which helps prevent the system from freezing during colder months. Additionally, the BBU 15 HE is designed for easy maintenance, featuring a simple access point for servicing, which can prolong the boiler’s lifespan and improve overall efficiency.

Safety is a top priority in any boiler installation, and the Baxi Potterton BBU 15 HE includes multiple safety features such as a pre-set temperature limit that prevents overheating and a pressure relief valve to manage excessive pressure within the system. These elements contribute to a safer home environment, providing peace of mind for homeowners.

Furthermore, the boiler is designed to operate quietly, minimizing disruptions in the home when heating systems are active. This is an important factor for many households where comfort is a priority.

In summary, the Baxi Potterton BBU 15 HE is a compact, efficient, and reliable boiler that provides an optimal solution for home heating and hot water needs. Its advanced features, safety systems, and user-friendly design make it a popular choice among homeowners, ensuring a cozy and comfortable living environment. Whether for a new installation or a replacement unit, this boiler stands out as a highly effective option in the market.
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