EU delivery from € 12.95 Stock items ordered before 14:00, dispatched the same working day Delivery across the EU WebwinkelKeur 8,8/10 Pay securely by card & Klarna
WhatsApp WhatsApp
Account
Log in Business login Create business account
Basket
★★★★★8,8/1024 reviews · verified by WebwinkelKeurAll reviews →
Boiler with display and pressure gauge
Boiler fault codes

ATAG boiler faults: fault codes, causes and parts (page 2 of 2)

Codes 151 to 234 of the 234 fault codes for ATAG. Looking for a specific code? Use the search on the first page.

ATAG boiler fault codes 151 to 234 of 234

The code list is split over 2 pages. Looking for a specific code? Use the search on the first page: it searches all 234 codes in one go.

CodeCause
C1 80No fault: briefly displayed when exiting chimney sweep function
C1 80No fault, but briefly displayed when exiting chimney sweep function
C1 81No fault: briefly displayed when exiting 'accelerator pedal function'
C1 81No fault, but briefly displayed when exiting accelerator pedal function
C40Flow sensor fault e.g. open, short-circuited, out of range.
C61No communication via Zbus
C62Bus thermostat connected, but no AAG Zbus thermostat
C78Water pressure sensor out of range or not connected or, if water pressure OK: pump defective
E 00Flame present when it should not be
E 00flame present when it should not be
E 01Short circuit 24 Volt circuit
E 01short circuit 24 Volt circuit
E 02No flame formation
E 02No flame formation; Check the data in Error mode. Appliance data during fault: 1 Error = 02 2 Operating status = 02 3 Flow temp. = xx* 4 Return temp. = xx* 5 kW burner = xx* 6 % pump = xx* * = variable value
E 02No flame formation; check the data in the Error mode. Appliance data during fault: 1 Error = 02 2 Operating status = 02 3 Flow temp. = xx* 4 Return temp. = xx* 5 kW burner = xx* 6 % pump = xx* * = variable value
E 02No flame formation; check the data in the Error mode. Appliance data during fault: 1 Error = 02 2 Operating status = 02 3 Flow temp. = xx* 4 Return temp. = xx* 5 kW burner = xx* 6 % pump = xx* * = variable value
E 03Air box temperature too high
E 03air box temperature too high
E 04The controller has detected a program error
E 05Control unit fault
E 05control unit fault
E 07Control unit fault
E 10Control unit fault
E 11Control unit fault
E 12Short circuit 24 Volt circuit
E 14Earth short of flow sensor T1
E 18Maximum flow temperature signal exceeded (T1 > 110°C)
E 19Control unit fault
E 24Control unit 'thinks' T1 and T2 have been swapped.
E 28No signal from the fan
E 28no signal from the fan
E 31Internal short circuit of flow sensor T1
E 32Short circuit of return sensor T2
E 36Flow sensor T1 contact open.
E 37Return sensor T2 contact open
E 68No software present
E 80Flue gas temperature too high
E0Flame detected in error Ionisation electrode faulty?
E0Flame detected when it should not be.
E2No flame formation
E2No flame formation Ionisation too low or ionisation cable not connected; no gas; no ignition?
E4Control Return temperature higher than flow temperature; max. Delta-T exceeded; sensor short circuit; sensor open circuit?
E4Control Return temperature higher than flow temperature; max. ∆T exceeded.
E5Fan does not run or keeps running.
E5Fan Fan not running or continues to run?
E9Maximum temperature Flow or return temperature too high; flue gas temperature too high (if flue gas sensor fitted)?
E9Maximum temperature
Ex01sc01Fan is not running at the correct speed. Fan defective.
Ex02sc01Number of ignition attempts exceeded at start of heat demand.
Ex02sc02No flame after 4 ignition attempts during heat demand.
Ex04sc01Flow temperature T1 too high.
Ex04sc02Flow sensor T1 short-circuited.
Ex06sc01Return temperature T2 too high.
Ex06sc02Return sensor T2 short-circuited.
Ex14sc01DeltaT not rising quickly enough.
Ex14sc01DeltaT between T1 and T2 > 35 degrees C.
Ex18sc01Unwanted flame formation.
FUSEGlass fuse on control unit defective or cable not connected to transformer
FUSE24 Volt circuit fuse defective
M024sc01Domestic hot water sensor T3 open (if P122=1).
M024sc02Domestic hot water sensor T3 short-circuited (if P122=1).
M024sc03Outdoor sensor T4 open.
M024sc04Outdoor sensor T4 short-circuited.
M024sc05Common temperature sensor T10 open.
M024sc06Common temperature sensor T10 short-circuited.
M024sc07Flue gas temperature T5 too high (> P290).
M024sc08Bus communication: possibly no bus communication cable connected.
M024sc09Temperature rise (gradient) too slow after start.
M024sc10DeltaT between T1 and T2 > 35 degrees C with gas valve open.
M024sc11Flue gas temperature T5 too high (> P290).
MX24sc09Temperature rise (gradient) too slow after start.
MX24sc10DeltaT between T1 and T2 > 35 degrees C with gas valve open.
MX24sc11Maintenance required
bl 18Wiring of T3 and T9 swapped
bl 88CH solar sensor open; the appliance continues to function normally except for the solar circuit
bl 89CH solar sensor short-circuited; the appliance continues to function normally except for the solar circuit
bl 90CH solar sensor short-circuited; the appliance continues to function normally except for the solar circuit
bl 91CH solar return sensor (T9) short-circuited; the appliance continues to function normally except for the solar circuit
bl 92Cylinder sensor (T6) open; the appliance continues to function normally except for the solar circuit
bl 93Cylinder sensor (T6) short-circuited; the appliance continues to function normally except for the solar circuit
bl 94Collector sensor (T7) open; the appliance continues to function normally except for the solar circuit
bl 95Collector sensor (T7) short-circuited; the appliance continues to function normally except for the solar circuit
bl 97T1-T6 too high; the appliance continues to function normally except for the solar circuit
bl 98T6 > T6 maximum

ATAG parts are available from Instalpunt. Back to the first page with the most searched codes and frequently asked questions.

Scroll to Top