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Updated: October 1, 2024

 ATAG boilers are known for their efficiency and high engineering standards. However, like any mechanical system, they can occasionally encounter problems. In this article, we will cover the most common ATAG boiler error codes, their meanings, and practical solutions. Whether you’re a homeowner or a technician, this guide will help you understand these errors and decide whether you need professional intervention.

Who Are ATAG Boilers?

A Legacy of Excellence

ATAG has been in the boiler industry for over 70 years, producing high-quality, energy-efficient boilers. Their reputation is built on delivering products that consistently outperform industry standards. Operating in multiple countries worldwide, ATAG boasts some of the most energy-efficient boilers in Europe. They also pride themselves on producing boilers with low NOx emissions, making them environmentally friendly options for both residential and commercial properties.

Read more: Common Sime Boiler Error Codes

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Key Features of ATAG Boilers

  • There are 4 different boiler models
  • Quiet operation
  • It is both Reliable and efficient
  • It has a compact design
  • It has a standard 10-year warrant, which can be extended to 14
  • User friendly

Benefits of Installing an ATAG Boiler

When you choose to install an ATAG boiler, you’re investing in quality, efficiency, and reliability. Here are some of the key benefits:

1. Variety of Models

ATAG offers four distinct boiler models, each designed to meet different heating requirements, ensuring flexibility for various property types.

2. Quiet Operation

These boilers are known for their silent operation, making them ideal for residential settings where noise may be a concern.

3. Compact Design

Their compact design allows for easy installation, even in homes with limited space.

4. Reliability and Efficiency

ATAG boilers are built to last, with robust components that provide both reliability and high efficiency.

5. Extended Warranty

ATAG boilers come with a standard 10-year warranty, which can be extended up to 14 years, offering peace of mind to homeowners.

6. User-Friendly Interface

The user-friendly controls make it easy for homeowners to operate the boiler without needing technical expertise.

However, it’s important to remember that sometimes it may be more cost-effective to replace an old boiler rather than constantly repairing it. Older boilers tend to lose efficiency over time, leading to higher energy bills. Investing in a new, more efficient boiler can save you money in the long term.

ATAG Boiler Error Codes and Troubleshooting

Boiler error codes are essential indicators that something is wrong with the system. Below, we list the most common ATAG boiler error codes, their meanings, and how to address them.

Common ATAG Boiler Error Codes

Fault CodeIssue
10Outside sensor error
20Flow sensor error
40Return sensor error
61Bus communication error
78Water pressure out of range
105Venting program active (runs for 7 minutes after power interruption)
110Safety temperature exceeded
111Maximum pressure exceeded
119X2 link missing positions 4 and 5
129Fan not starting
133No flame after 5 ignition attempts
151Fan error or defective control unit
154Return temperature higher than flow (flow increases too quickly)
101Overheat error
102Pressure sensor fault
104Flow check failed
108Pressure too low, needs filling
1P4Pressure below 0.5 – 0.8 bar
109Pressure greater than Pmax
110Send probe damaged
112Return probe damaged
114Outdoor sensor error
141Central heating flow switch open
201Domestic hot water (DHW) probe damaged
203Tank probe damaged
303Printed Circuit Board (PCB) error
304Too many resets
501No flame detected
612Fan fault (fan not starting)

Read about: Intergas Boiler Error Codes / Fault

ATAG Boiler Error Codes / Fault Codes

Troubleshooting Common Faults

1. Pressure-Related Errors (Codes 108, 1P4, 109)

  • Cause: Most of these issues arise when the boiler’s water pressure is too low or too high.
  • Solution: Check the pressure gauge on the boiler. For low pressure (below 1 bar), refill the system via the filling loop. If the pressure is too high, bleed the radiators to reduce pressure.

2. Flame Detection Issues (Code 133, 501)

  • Cause: These errors indicate that the boiler is having trouble igniting.
  • Solution: Check that the gas supply is active and the ignition electrodes are clean. If the problem persists, the gas valve may need adjustment or replacement.

3. Sensor Errors (Codes 10, 20, 40, 112)

  • Cause: Sensors are crucial for measuring various parameters like temperature and pressure. When a sensor is faulty, the boiler may not function correctly.
  • Solution: A Gas Safe engineer should inspect and replace any damaged sensors.

iC and iS Combi Boiler Error Codes

These specific models of ATAG boilers also have unique error codes:

Fault CodeSystem Behavior
50DHW sensor error
117Pressure greater than 3 bar or pump pressure increase too high
118Pressure less than 1 bar or no pump detection

For these combi boilers, regular maintenance is crucial to prevent pressure and sensor-related issues.

Other Fault Codes and Their Meanings

Sometimes, you may notice a spanner symbol on your boiler’s display. This can indicate two things:

  1. The boiler is in service mode.
  2. There is a blocking issue.

If the problem persists after a few reset attempts, it might result in the boiler locking itself. In this case, contact a qualified engineer to inspect and resolve the issue.

Read more: Combi boilers common faults  

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FAQs

Where are ATAG boilers manufactured?

ATAG boilers are engineered in Holland and use the highest quality stainless steel and brass components. Facts which explain why they are built to last. And why a 14 year warranty is possible with this brand of boilers.

How efficient are ATAG boilers?

The efficiency rating can show you how much of the fuel is converted into usable energy for the central heating or domestic hot water. Modern ATAG boilers have an ErP Efficiency rating of 94%, making them highly efficient.

How long is ATAG warranty?

All ATAG boilers come with a 10 year warranty as standard with a lifetime guarantee on the heat exchanger. This warranty can be extended to 14 years.

Why does my ATAG boiler keep losing pressure?

Possible causes can be broken diaphragms and airlocks, problems with the thermostat, low water levels or failure of motorised valves. It’s a good idea to check if an issue with boiler pressure or your thermostat is causing the issue.

What should water pressure be on ATAG boiler?

As with most boiler models, the ATAG boiler water pressure should be around 1.5 bar.