Baxi MainEco Heat 15 Installation And Service Manual

Baxi MainEco Heat 15

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Installation and Service Manual

Gas Fired Wall Mounted Powered Flue Condensing Boiler

en

United Kingdom

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.

M

MainEco Heat

15 - 18 - 24

Table of Contents

Other manuals for Baxi MainEco Heat 15

User Guide32 pages

Questions and Answers:

J
John CrawfordAug 22, 2025
What to do if my Baxi MainEco Heat 15 Boiler is showing 3 flashes red?
- E
  Erin WalshAug 22, 2025
  If your Baxi Boiler displays 3 red flashes, this indicates issues such as no ignition, no flame detected after ignition, a false flame signal, or repeated flame loss. Here's what you can do: * Verify the appliance is properly earthed. * Inspect the ignition electrode for its condition; clean or replace it if needed. * Check the gas valve operation. * Examine the flue for any blockages. * Ensure correct combustion and gas valve settings. * Check the condensate drain for any blockages.
V
Valerie FosterSep 1, 2025
What to do if my Baxi Boiler is showing 5 flashes red?
- K
  Kerry HansenSep 1, 2025
  If your Baxi Boiler is showing 5 red flashes, it indicates a bad connection to the PU or a parameter error/faulty PU. Check the PCB and the condition of the wiring loom. Replace the PU and recommission.
N
Nicholas SnyderAug 31, 2025
What does it mean when my Baxi Boiler flashes 4 times green?
- K
  Karen WilliamsAug 31, 2025
  If your Baxi Boiler shows 4 green flashes, it indicates a bad connection or wiring fault, or an internal communication fault. Check the wiring and connections between the boiler and the User Interaction Controller, as well as within the box. If necessary, replace the control/fan assembly.
E
Erin WatsonAug 30, 2025
What does 4 flashes red mean on a Baxi MainEco Heat 15?
- J
  John JohnsonAug 30, 2025
  If your Baxi Boiler is showing 4 red flashes, it could be due to a fan calibration error or fan failure. If the fan is operating, check the flue installation and its condition. If necessary, replace the control/fan assembly.
L
Lisa KingAug 28, 2025
How to troubleshoot 1 flash red on Baxi MainEco Heat 15?
- S
  Sean RandallAug 28, 2025
  If your Baxi Boiler is showing 1 red flash, it indicates a bad connection to the flow or return temperature sensor, a fault with the temperature sensors, low or no flow through the boiler, or reverse flow. To address this: * Check the connections to the temperature sensors/PCB and the condition of the wiring loom. * Check the resistance of the temperature sensors. * Check the pump operation and system circulation.
W
william49Aug 27, 2025
What to do if my Baxi MainEco Heat 15 is showing 2 flashes red?
- A
  Angela WebbAug 27, 2025
  If your Baxi Boiler shows 2 red flashes, it means the over-temperature thermostat on the heat exchanger has been activated, there's no water flow through the heat exchanger, the over-temperature thermostat is faulty or has a bad connection, there's a PCB over-temperature condition, or there's a flue fault. To resolve this: * Check the connections to and operation of the O/T thermostat and air pressure switch (if fitted) and PCB and condition of wiring loom. * Check the system pressure and ensure the system is not air-locked. * Check the pump operation and system circulation. * Check the flue condition.
C
camachohollyAug 27, 2025
How to fix 1 flash green on Baxi MainEco Heat 15?
- M
  Mark RuizAug 27, 2025
  If your Baxi Boiler displays 1 green flash, it means that the maximum flow temperature has been exceeded, the flow temperature rise rate is too high, or there's an excessive difference between the flow and return temperatures. You should check the system circulation and pump operation, check demands for boiler operation, check the temperature setting and check the temperature sensors in the boiler.
A
Ann WhiteAug 25, 2025
Why is my Baxi Boiler flashing 3 green lights?
- J
  jnealAug 26, 2025
  If your Baxi Boiler is flashing 3 green lights, it means no flame was detected during operation. Check that the gas supply is turned on and available, especially if you're using a pre-payment meter. Also, check the flue condition.
G
Gabriel PetersAug 25, 2025
Why is my Baxi MainEco Heat 15 flashing 1 red?
- T
  turnerronaldAug 25, 2025
  A single red flash on your Baxi Boiler indicates a potential issue with the temperature sensors or water flow. Check the following: Examine the connections to the temperature sensors/PCB and the condition of the wiring loom. Verify the resistance of the temperature sensors. Ensure the pump is operating correctly and that there is proper system circulation. Low or reverse flow through the boiler can also cause this issue.

Baxi MainEco Heat 15 Specifications

General

Type	Combi
Boiler Type	Condensing
Output	15 kW
Fuel Type	Natural Gas
Mounting	Wall-mounted
ERP Rating	A
CH Output (kW)	15 kW
Dimensions (H x W x D)	700 x 390 x 285 mm
Central Heating Flow Temperature Range	30 - 80 °C
Max Working Pressure	3 bar
Fuel	Natural Gas

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