18.0 Fault Finding

I

1.

2.

Check supply pressure at the gas valve:-

Minimum 17 mbar

Check and correct if necessary

1.The mechanical set of the gas valve (CO2 values - see instruction)

2.Flame sensing electrode and lead connections

3.Flame sensing electrode position

Flame current should be more than 0.5 μ A

YES

NO

Replace PCB

Replace flame sensing electrode

J

1.

Overheat thermostat operated or

NO

 

 

Allow to cool. Continuity

YES

 

 

 

faulty, i.e. continuity across

 

 

across thermostat terminals

 

Replace safety thermostat

 

 

 

 

 

 

 

thermostat terminals

 

 

 

more than 1.5 ohm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace PCB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K

 

Is there 230V at:

 

 

 

 

 

 

 

 

 

 

 

YES

1.

 

 

 

 

 

 

Motor 3-way valve

 

 

 

 

 

NO

2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCB - X3 connector terminals

 

 

 

 

 

 

 

5

& 6 central heating mode

 

 

 

 

5

& 7 domestic hot water mode

 

 

 

YES

Change pump supply cable

Replace motor 3-way valve

Replace PCB

L

M

1.

1.

Fan connections correct at fan.

PCB - X401 connector terminals 5,6,7 & 8

Temperature sensors faulty. Cold resistance approximately 10kΩ @ 25° C (CH sensor)

20kΩ @ 25° C (Flue sensor)

(resistance reduces with increase in temp.)

YES

Replace fan

 

NO

Replace sensor

 

 

 

YES

 

2.

If pump is running the heat exchanger could be

Replace heat exchanger

 

 

 

 

obstructed

 

 

 

 

 

 

 

 

 

 

© Baxi Heating UK Ltd 2012

59

Page 58 Page 60
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Image 59
Baxi Potterton 47-393-42, 47-393-40, 47-393-39 manual Replace safety thermostat, Replace PCB Is there 230V at, Replace sensor
Page 58 Page 60

47-393-40, 47-393-41, 47-393-39, 47-393-42 specifications

The Baxi Potterton 47-393-42, 47-393-39, 47-393-41, and 47-393-40 are models of high-efficiency gas boilers designed for residential heating. These models are well-known for their reliability, advanced technology, and user-friendly features, making them a popular choice among homeowners looking to improve their heating systems.

One of the standout features of these models is their energy efficiency. Each unit is engineered to comply with stringent energy-saving regulations, significantly reducing utility bills while maintaining optimal heating performance. They are rated with impressive efficiency ratings, which can lead to long-term savings and a reduced carbon footprint.

The Baxi Potterton range employs a heat exchanger system designed to maximize heat transfer and minimize energy waste. This sophisticated technology ensures that the boiler operates at peak efficiency, providing ample heating for homes even in the coldest months. The use of a durable, high-quality heat exchanger material contributes to the longevity of the unit, reducing the need for frequent repairs or replacements.

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Safety features are inherent in these models, including built-in safeguards against overheating and pressure fluctuations. The automatic shut-off mechanism ensures that the boiler operates within safe parameters, providing peace of mind to users.

Furthermore, maintenance is simplified with the easy access design. The accessible components make it straightforward for service technicians to perform routine checks and repairs. Regular maintenance is essential for sustaining high performance and extending the lifespan of the boiler.

In conclusion, the Baxi Potterton 47-393-42, 47-393-39, 47-393-41, and 47-393-40 models represent a blend of efficiency, safety, and convenience. Their advanced technologies and features not only enhance the user experience but also contribute to more sustainable heating solutions for homes. Investing in one of these advanced boilers ensures reliable performance, lower energy costs, and a commitment to environmental responsibility.
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