If the boiler is displaying an error code, and the code is 118 or 108 or 1P4 (which indicates low water pressure) – please see the article “What does the 118/108/1P4 code mean?” – otherwise, please call us on 0800 680 0100 – options 1 then 1. Whilst we embrace e-mail and social media channels, they should not be used for reporting problems with your boiler.

Q: Where can I download the ONE controller app?
You can download the app for an Apple devices and Android devices via:

https://itunes.apple.com/gb/app/atag-one/id929707260?mt=8
https://play.google.com/store/apps/details?id=io.cordova.AtagUser&hl=en_GB

Q: My system comes on during the night or in cold weather when not asked for (System has a 7 day digital wireless room stat or 24 hour mechanical wireless room stat)?
Check the minimum room temperature setting; this should be a low temperature setting e.g. 8 °C to 12 °C. If the minimum setting is too high e.g. 18 °C, then when the room temperature falls below 18 °C during an off period, the wireless room stat will alert the boiler and heat the house up to 18 °C even if no heat is required.

Q: What do I do if the boiler has a fault code 118?
Error code 118 could mean that the system pressure is too low and you may see that the system pressure gauge indicates that the pressure is below 0.8 – 1 bar.

The pressure within the system can be seen in two ways. There is an analogue gauge, which can be found under the bottom left hand side of the boiler or you can find a digital reading from the digital display of the control panel. The digital display can be seen by pressing the Eco button for 6 seconds and then scroll through (tap + plus button) to ‘A6’ which will display the water pressure.

The system pressure should be set around 1.0 – 1.2 bar when the water is cold.

When the system is working and the water is heated up within the system, since water expands due to heat and you may see the pressure rise up to around 1.8 – 2.4bar. This is normal as water system pressure increases due to heat.

So we are looking for the system pressure to be set around 1.0 – 1.2 bar when the water is cold.

Turn off any clocks and room thermostat for heating or hot water controls.

On the iC and iC Economiser Plus models, to re-pressurise the system you will need to find the filling loop (copper ‘U’ shaped tube with two nuts at each end). On the underside of the boiler there is a filling loop position where this copper ‘U’ shaped tube will connect between the small blue and black isolation valve connection. If not in position, remove the caps and install as shown and tighten up the nuts hand tight.

The taps should be opened a quarter of a turn and the water will start to refill the system (water should be heard filling the system). You should see the pressure gauge rise back up between 1 bar and 1.2 bar pressure and then stop filling. The error code 118 will stop and the boiler will now operate. If the error code 118 is still active, fill up the system a little more but not over 1.4bar.

The display should now show ‘OK’, which means the pressure level is correct and the boiler is ready to operate.

(If you do fill the system too much and the pressure gauge is too high, just bleed water from a radiator until the pressure on the gauge goes down to below 1.2 bar).

Control Unit

Symbols

Symbol	Explanation
	If there is heat request, it is indicated by a square around the rad symbol and the description at the bottom of the screen of ‘C.Heating Active’.
	If there is a hot water request, this is indicated by a square around the tap symbol and the description at the bottom of the screen of ‘ DHW Active’.
	Visible when boiler is active for heating or DHW
ECO	Visible when DHW comfort function is not active
	Visible when pump is set to continuously. Flashing when frost program is active (iC & iS Range only)

Errors

Symbol	Explanation
	Blocking Code with spanner symbol Error is temporary and will clear itself or will lock the boiler after several attempts (error)
	Error Code with bell symbol Boiler is locked and can only be remedied by a reset and/or intervention by a service technician

Error Codes

Code	Explanation
101	Overheat
102	Pressure Sensor Error
103	Flow Check Failed 3 times (1 or 3 or 4, last 1)
104	Flow Check Failed
105	Flow Check Failed 3 times (1 or 3 or 4, last 3)
106	Flow Check Failed 3 times (1 or 3 or 4, last 4)
107	Flow Check 5 Failed
108	Pressure < Pmin ( < 0.5 bar), Filling needed
1P1	Flow Check 1 Failed
1P2	Flow Check 3 Failed
1P3	Flow Check 4 Failed
1P4	Pressure < Pmin ( 0.5 < 0.8 bar), Filling needed
1P9	Water pressure dynamic check
109	Pressure > Pmax
110	Send Probe Damaged
112	Return Probe Damaged
114	Outdoor Sensor Damaged
118	Send and Return probe plausibility Check failed
140	Dynamic Pressure Check Failed (or no pump detection)
141	CH Flow Switch open (IR Boiler)
201	DHW Probe Damaged (Combi)
203	Tank Probe Damaged (Solo)
303	PCB Fault
304	Too many resets
306	PCB Fault
309	Gas Relay Check Failed
41Z	Room sensor z not available
501	No Flame detected
502	Flame detected with Gas Valve closed ( False Flame)
504	Flame lift
5P2	1stIgnit Failed

Control Unit

Symbols

Symbol	Explanation
	Visible when DHW program is active. Flashing when there is a heat demand for DHW (iC Range only)
	Visible when heating program is active. Flashing when there is a heat demain for heating
	Visible when boiler is active for heating or DHW
	Visible when DHW comfort function is not active
	Error indication (accompanied with a code)
	Service-mode or blocking
	Visible when pump is set to continuously. Flashing when frost program is active (iC & iS Range only)

Errors

Symbol	Explanation
	Blocking Code with spanner symbol Error is temporary and will clear itself or will lock the boiler after several attempts (error)
	Error Code with bell symbol Boiler is locked and can only be remedied by a reset and/or intervention by a service technician

Error Codes

Code	Explanation
10	Outside sensor
20	Flow sensor
40	Return sensor
50	DHW sensor (iC range only)
61	Bus communication
78	Water pressure out of range
105	Venting program active when power turned on or interrupted (runs approx. 7mins)
110	Safety temperature exceeded
111	Maximum pressure exceeded
117	Pressure too high (greater than 3 bar) or pump pressure increase too high (iC and iS range only)
118	Pressure too low (less than 1 bar) or pump pressure increase too low – no pump detection (iC and iS range only)
119	Link on X2 position 4 and 5 missing
129	Fan error (fan does not start up)
133	No flame after 5 ignition attempts
151	Fan error (speed control is not achieved or is out of range) or control unit defective
154	Flow temperature increases to fast (return greater than flow)

Error code 1P4 or 108 could mean  This means that the system pressure is too low and you may see that the system pressure gauge indicates that the pressure in the system is below the 0.8 bar pressure.

The pressure within the system can be seen in the top right of the display when an error code comes up.

The system pressure should be set around 1.0 – 1.1 bar when the water is cold.

When the system is working and the water is heated up within the system, water expands due to heat and you may see the pressure rise up to around 1.8 – 2.4bar when hot. This is normal as water system pressure increases due to heat.

So we are looking for the system pressure to be set around 1.0 – 1.1 bar when the water is cold.

Turn off any clocks and room thermostat for heating or hot water controls.

On the iC and iC Economiser Plus models, to re-pressurise the system you will find a filling loop (copper ‘U’ shaped tube with two nuts at each end) on the underside of the boiler or a metal braded flexible hose external of the boiler on the pipework with one or two tap connections at the either end of the filling loop, which is normally used on iS range of boilers as well.

The tap or taps should be opened a quarter of a turn and the water will start to refill the system (water should be heard filling the system). You should see the pressure on the front display rise back up between 1 bar and 1.1 bar pressure and then stop filling.

Once the pressure is between 1 bar and 1.1 bar turn the taps back to the off position and the water will stop filling the system. The error code 1P4 or 108 will stop and the boiler will now operate. If the error code 1P4 or 108 is still active, fill up the system a little more but not over 1.4 bar.

The display should now show the normal screen of temperature(s) and the pressure, which means the pressure level is correct and the boiler is ready to operate.

(If you do fill the system too much and the pressure gauge is too high, just bleed water from a radiator until the pressure on the gauge goes down to below 1.0 bar).

Error code 118 could mean that the system pressure is too low and you may see that the system pressure gauge indicates that the pressure in the system is below the 0.8 – 1 bar pressure.

The pressure within the system can be seen in two ways. There is an analogue gauge, which can be found under the bottom left hand side of the boiler or you can find a digital reading from the digital display of the control panel. The digital display can be seen by pressing the Eco button for 6 seconds and then scroll through (tap + plus button) to ‘A6’ which will display the water pressure.

The system pressure should be set around 1.0 – 1.2 bar when the water is cold.

When the system is working and the water is heated up within the system, water expands due to heat and you may see the pressure rise up to around 1.8 – 2.4bar when hot. This is normal as water system pressure increases due to heat.

So we are looking for the system pressure to be set around 1.0 – 1.2 bar when the water is cold.

Turn off any clocks and room thermostat for heating or hot water controls.

On the iC and iC Economiser Plus models, to re-pressurise the system you will find a filling loop (copper ‘U’ shaped tube with two nuts at each end) on the underside of the boiler or a metal braded flexible hose external of the boiler on the pipework with one or two tap connections at the either end of the filling loop, which is normally used on iS range of boilers as well.

On the underside of the boiler there is a filling loop position where this copper ‘U’ shaped tube will connect between the small blue and black isolation valve connection. If not in position, remove the caps and install as shown and tighten up the nuts hand tight.

The taps should be opened a quarter of a turn and the water will start to refill the system (water should be heard filling the system). You should see the pressure gauge rise back up between 1 bar and 1.2 bar pressure and then stop filling. The error code 118 will stop and the boiler will now operate. If the error code 118 is still active, fill up the system a little more but not over 1.4bar.

The display should now show ‘OK’, which means the pressure level is correct and the boiler is ready to operate.

(If you do fill the system too much and the pressure gauge is too high, just bleed water from a radiator until the pressure on the gauge goes down to below 1.2 bar).

During winters the UK has experienced prolonged spells of extremely cold weather – down to minus 15°C in some areas. This resulted in a significant increase in the number of calls to boiler manufacturers and heating installers from householders with condensing (high efficiency) boilers where the condensate drainage pipe had frozen and become blocked with ice, causing boiler shutdown. In the vast majority of cases, problems occurred where the condensate drainage pipe was located externally for some part of its length.

Due to the cold weather our ATAG boilers can show a fault code 133 or 501 (No flame after 5 attempts) due to the condensate pipe freezing, as a result of the condensate not being able to run away from the boiler and the boiler to eventually come up with a fault code 133 or 501 due to that fact.

The condensate pipe can be thawed by applying a hot water bottle, a microwaveable heating pack (the sort used for muscular aches and pains) or cloths soaked in warm water to the exterior of the pipe, close to the likely point of blockage. Warm water can also be poured onto the pipe from a watering can or similar container. Do not use boiling water.Note: You should not attempt to thaw a condensate drain pipe if you cannot easily reach it from ground level. Be aware that any water used can quickly freeze if it falls onto pathways – causing a possible slip hazard.

In most cases, once the condensate drain pipe is cleared and a reset has been carried out, the boiler will re-ignite using its automatic operating sequence.

The Heating and Hotwater Industry Council (HHIC) have also published guidance for householders on frozen condensate drainage pipes.

Q: How do I find out which ATAG boiler is right for my home?

You can use our simple tool here to find the perfect ATAG heating solution for your home. Also, you can locate an ATAG selected installer in your local area here. They will able to provide you more information and a quote.

New ‘Boiler Plus’  regulation effective April 2018

From 6th April 2018, homeowners are required to comply with Part L of the Building Regulations – commonly known as ‘Boiler Plus’ when they have a new boiler installed. The regulation introduces new energy efficiency standards for domestic heating, and applies to all households in England.

1. All new gas boilers installed within a domestic property in England must have an ErP energy efficiency of at least 92%.
2. All new gas boiler installations must include both time and temperature controls.
3. Every new gas combination boiler must be installed with at least one additional energy efficiency measure from the following:
   • A passive flue gas heat recovery device
   • A smart control with automation and optimisation functions
   • Load compensation
   • Weather compensation

ATAG is proud to support the energy efficiency mission. We pride ourselves on providing homeowners with the most efficient domestic boiler solution available.

The Department for Business, Energy & Industrial Stategy (BEIS) has also issued ‘Boiler Plus’ FAQs, which you can download here .

This regulation does not apply to new build properties.

Q: How do I buy an ATAG boiler?

To help keep UK homes safe, we only supply our products to selected Gas Safe Registered installers. You cannot buy our products from ATAG. To find a local ATAG Selected installer, please use our ‘Find an ATAG Selected Partner’ tool here.

Q: How much is an ATAG boiler?

Every home and its needs are different. Our ATAG Selected Partners will help you decide which ATAG system will be most efficient for you and then provide a competitive, tailored quote accordingly. To find a local ATAG Selected Partner, please use our ‘Find an ATAG Selected Partner’ tool here.

Q: How do I register my warranty?

Click here to register your warranty.

Q: I have a question regarding my new boiler, who do I contact?

You can contact us on 0800 680 0100 or you can contact the ATAG Selected installer who installed your boiler directly.

For any ATAG OneZone setup questions, please visit the OneZone support page: https://www.atagheating.co.uk/homeowner/onezone-support

For any ATAG OneZone issues, please visit the ATAG Zone app troubleshooting tips page: https://www.atagheating.co.uk/homeowner/support/apptroubleshooting