PCB Control Box

Securing Screw

PCB Control

Box

Boiler Front

Panel

Spark

Generator

Electrode

Assembly

Injector

Gas Feed

Pipe

Fan

Fig. 44

Reset Switch

Off Position

Fig. 43

Sensing Pipe

Gas Valve

Discharge Pipe

Locking Clip

Condensate Pump

9.0 Annual Servicing

9.2Annual Servicing - Inspection

1.Ensure that the boiler is cool.

2.Ensure that the gas supply to the boiler is isolated.

3.Operate the Reset switch (Fig. 41) to activate the condensate pump and then repeat. This will empty most of the condensate from the sump.9. Isolate the boiler from the electrical supply.

4.Undo &remove the flue sampling plug and washer. Remove the screws retaining the boiler front panel, and lift the panel away (Fig. 43).

5.Remove the screw securing the PCB control box and swing the box to the right (Fig. 43).

6.Disconnect the two plugs from the fan motor and remove the sensing pipe from between the gas valve and fan outlet.

7.Remove the gas feed pipe and washers, and extract the injector from the gas/air inlet manifold.

8.For ease of access disconnect the following:-

a)2 pin plug on NTClead

b)all wires from electrode assembly

c)all wires from spark generator

d)both wires from the overheat thermostat

e)the red and black wires connected together

9.Undo the two securing nuts and remove the spark generator and bracket.

10.Undo the combustion panel securing nuts and remove the special spring washers. Remove the complete fan & panel assembly from the boiler.

11.Lay the assembly to one side. The outer insulation panel is fitted to the rear of the combustion box panel.

12.Clean inside the heat exchanger and examine the condition of the fins.

13.Examine the burner, electrodes, insulation and seal, replacing if necessary. Also check the condition of the three insulation pieces in the rear of the heat exchanger.

14.Disconnect the wires on the condensate pump motor and pull off the plastic discharge pipe. Cut and remove the transit cable tie. It is not necessary to replace this item.

15.Squeeze the two retaining clips and turn the pump anticlockwise to remove it. Draw it upwards from the sump.

16.Clean any debris from the sump and examine the condition of the pump seal, replacing if necessary.

17.Reassemble in reverse order of dismantling, checking and replacing any components as necessary. Recommission the boiler and complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication.

28© Baxi Heating UK Ltd 2009

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Baxi Potterton BBU 15 HE manual Annual Servicing Inspection
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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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