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ATAG

Q Series 35kW

Combi Boiler 35kW 2018-present ErP A+ 38 fault codes

<p>The Q Series 35kW is a combi boiler from ATAG, available at 35kW output. Produced 2018-present.</p>

Q Series 35kW Fault Codes 38

Code Description Severity Type
10 Flow NTC Fault Flow sensor faulty. Medium Engineer View Guide
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 View Guide
11 Return NTC Fault Return sensor faulty. Medium Engineer View Guide
110 Safety Temperature Exceeded / Overheat On ATAG IC/IS boilers, code 110 indicates the safety temperature limit has been exceeded. Also displayed… High Engineer View Guide
111 Pressure Too High The system water pressure has exceeded the maximum safe limit on ATAG boilers. Medium Engineer View Guide
12 DHW NTC Fault Hot water sensor faulty. Medium Engineer View Guide
129 Fan Not Starting The boiler fan is not starting up correctly, preventing safe ignition. High Engineer View Guide
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 View Guide
15 Fan Fault Fan not running. High Engineer View Guide
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 View Guide
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 View Guide
16 APS Fault Air pressure switch fault. High Engineer View Guide
17 Gas Valve Fault Gas valve not responding. High Engineer View Guide
18 Ignition Failure Failed to ignite. High Engineer View Guide
19 Flame Lost Flame lost during operation. High Engineer View Guide
20 Flow Sensor Error The heating flow temperature sensor has a fault. Medium Engineer View Guide
21 Overheat Safety thermostat activated. High Engineer View Guide
22 Low Pressure Pressure too low. Low DIY View Guide
23 Pump Fault Pump not running. High Engineer View Guide
24 Rapid Temperature Rise Flow temp rising too fast. High Engineer View Guide
25 Condensate Blocked Condensate drain blocked. Medium DIY View Guide
26 Diverter Fault Valve stuck. Medium Engineer View Guide
27 PCB Fault Internal PCB error. High Engineer View Guide
28 Combustion Fault Air/gas outside limits. High Engineer View Guide
29 Pressure Sensor Fault Sensor faulty. Medium Engineer View Guide
30 Frost Protection Frost protection active. Medium DIY View Guide
303 PCB Error The main Printed Circuit Board has detected an internal fault. High Engineer View Guide
304 Too Many Resets The boiler has been reset too many times and has entered a protective lockout. Medium DIY View Guide
31 eBUS Fault Communication fault. Medium Engineer View Guide
32 Flue Gas Overheat Flue gas too hot. High Engineer View Guide
33 Outdoor Sensor Outdoor sensor faulty. Low Engineer View Guide
34 Mains Voltage Voltage outside range. Medium Engineer View Guide
35 EEPROM Error PCB memory error. High Engineer View Guide
36 Flame After Shutdown Flame with gas off. High Engineer View Guide
40 Return Sensor Error The heating return temperature sensor has a fault. Medium Engineer View Guide
501 No Flame Detected No flame signal detected during operation. Separate from code 133 (ignition failure) — this may occur… Medium Engineer View Guide
61 Bus Communication Error There is a communication fault on the bus between the boiler and external controls. Medium Engineer View Guide
78 Water Pressure Out of Range The system water pressure is either too high or too low on ATAG boilers. Low DIY View Guide

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