Baxi Heat 625 Installation And Service Manual

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These instructions include the Benchmark Commissioning Checklist and should be left with the

user for safe keeping. They must be read in conjunction with the Flue Installation Guide.

Heat

Installation and Service Manual

Gas Fired Wall Mounted Condensing Boiler

613 - 616 - 619 - 625 - 630

en

United Kingdom

Table of Contents

Other manuals for Baxi Heat 625

User Guide32 pages

Questions and Answers:

D
Donna SimonAug 8, 2025
How to troubleshoot temperature protection issues in my Baxi Heat 625 Boiler?
- B
  Brooke RojasAug 8, 2025
  If your Baxi Boiler is experiencing temperature protection issues, it could be due to several reasons: * The maximum flow temperature may have been exceeded. * The flow temperature rise rate might be too high. * There could be an excessive difference between the flow and return temperatures. To resolve this: * Check the system circulation and pump operation. * Verify the demands for boiler operation. * Check the temperature setting. * Inspect the temperature sensors in the boiler.
B
Brittany HarperAug 13, 2025
What to do if my Baxi Heat 625 Boiler displays a communication fault?
- N
  nielsencherylAug 13, 2025
  If your Baxi Boiler shows a communication fault, the cause may be a bad connection or wiring fault, or an internal communication fault. To address this: * Check the wiring and connections between the boiler and the User Interaction Controller, and also within the box. * If necessary, replace the combustion control unit.
B
bmarksAug 18, 2025
Why is my Baxi Boiler losing flame?
- T
  Terri McdonaldAug 18, 2025
  If your Baxi Boiler is experiencing flame loss, it means no flame was detected during operation. Here’s what you can do: * First, check that the gas supply is turned on and available, especially if you're using a pre-payment meter. * Next, check the condition of the flue.
D
Darrell MccormickAug 25, 2025
What does shutdown input mean on my Baxi Heat 625 Boiler?
- M
  Michael BoothAug 25, 2025
  If your Baxi Boiler is showing a shutdown input error, it means the BL terminals on the User Interaction Controller are open circuit. Here’s how to troubleshoot: * If a condensate pump is wired to these terminals, check its operation. * Check the wiring to the BL terminals, ensuring the link is present or the connections to the external device are correct.
V
Vincent HarrisAug 28, 2025
What causes a parameter fault in a Baxi Heat 625 Boiler?
- J
  James ButlerAug 28, 2025
  If your Baxi Boiler is showing a parameter fault, it could be due to a parameter error, a faulty PU, a configuration error, or a PCB fault. The suggested solution is to replace the combustion control unit.
C
Charles HansenSep 2, 2025
What does a miscellaneous error mean on my Baxi Heat 625?
- N
  Nicholas OwensSep 2, 2025
  If your Baxi Boiler has a miscellaneous error, it indicates an internal fault in the combustion control unit. The suggested solution is to replace the combustion control unit.

Baxi Heat 625 Specifications

General

Mounting	Wall-mounted
Output Power	25 kW
CH Output	25 kW
DHW Output	25 kW
ERP Rating	A
Fuel Type	Natural Gas
Flow Rate	10.2 L/min
Heating Flow Temperature Range	30-80 °C
DHW Flow Rate at 35°C Rise	10.2 L/min
Gas Supply Pressure	20 mbar
Type	Combi Boiler
Dimensions (HxWxD)	700 x 400 x 280 mm

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