ATAG
iC 36
Combi Boiler
36kW
2014-2019
ErP A
38 fault codes
<p>The iC 36 is a combi boiler from ATAG, available at 36kW output. Produced 2014-2019.</p>
iC 36 Fault Codes 38
Code
Description
Severity
Type
108
Low Water Pressure — Refill Required
On ATAG IC/IS boilers, code 108 indicates the system pressure needs filling (below 0.5 bar). Also…
Low
DIY
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110
Safety Temperature Exceeded / Overheat
On ATAG IC/IS boilers, code 110 indicates the safety temperature limit has been exceeded. Also displayed…
High
Engineer
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111
Pressure Too High
The system water pressure has exceeded the maximum safe limit on ATAG boilers.
Medium
Engineer
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129
Fan Not Starting
The boiler fan is not starting up correctly, preventing safe ignition.
High
Engineer
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133
Ignition Failure — No Flame After 5 Attempts
The most common ATAG fault code. The boiler has failed to ignite after 5 attempts. Frequently…
Medium
DIY
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151
Fan Speed Error / Control Unit Fault
The fan is not achieving the correct speed, or the control unit has detected a defective…
High
Engineer
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154
Return Temperature Higher Than Flow / Rapid Rise
The return temperature is greater than the flow temperature, or the flow temperature is rising too…
Medium
Engineer
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303
PCB Error
The main Printed Circuit Board has detected an internal fault.
High
Engineer
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304
Too Many Resets
The boiler has been reset too many times and has entered a protective lockout.
Medium
DIY
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40
Return Sensor Error
The heating return temperature sensor has a fault.
Medium
Engineer
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501
No Flame Detected
No flame signal detected during operation. Separate from code 133 (ignition failure) — this may occur…
Medium
Engineer
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61
Bus Communication Error
There is a communication fault on the bus between the boiler and external controls.
Medium
Engineer
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78
Water Pressure Out of Range
The system water pressure is either too high or too low on ATAG boilers.
Low
DIY
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