AGA duplex thermocouple Replacement
Failure symptoms, diagnostic tests, fitment and part numbers — supplied and installed at your home across the Seattle–Tacoma metro, WA.
- Sensor
- Very common
Symptoms
Signs this part is failing
- Open circuit
- Differential drift between the two elements
- Tests OK cold, fails hot
Testing
How it is tested
Measure across the green and white conductors of each thermocouple (4 wires at the plug).
Part numbers
OEM / factory part numbers
AGA part numbers change by revision and color — we verify against your serial plate before ordering.
- AE4M280732
- Factory part number
Fitment
Series this part fits
Good to know
Replacement notes
One part number covers all five zones. Refit the rubber conduit bungs after replacement or the panel will overheat (code 139).
Safety & DIY disclaimer
Guides on this site are for information only. Appliance repair involves 240V electricity, gas connections, refrigerant and heavy cast-iron parts — anything you do yourself is at your own risk and can damage the appliance or cause injury. The safe option is to book a qualified technician.
Related
Problems this part solves
Same category
More sensor parts
Frequently asked questions
How do I know the AGA duplex thermocouple is failing?
Typical failure signs: open circuit; differential drift between the two elements; tests ok cold, fails hot. A technician confirms it with the diagnostic test described on this page.
Do you supply the part, or do I buy it myself?
We supply and install it. We install genuine or OEM-quality parts, and we verify the part number against your unit's serial plate before ordering — AGA part numbers change by revision and color.
We supply and install this part
Genuine/OEM sourcing verified by serial plate, installed at your home, covered by a written parts-and-labor warranty.
Mon–Sun 8:00AM–8:00PM
Independent service company — not affiliated with or authorized by AGA / AGA Rangemaster (Middleby). We repair out-of-warranty AGA appliances.