# AGA duplex thermocouple Replacement

> AGA duplex thermocouple: failure signs, how it is tested, which AGA series it fits and OEM part numbers. Supplied and installed at your home. Mon–Sun 8:00AM–8:00PM. Call or text 206-427-7323.

Failure symptoms, diagnostic tests, fitment and part numbers — supplied and installed at your home across the Seattle–Tacoma metro, WA.

**Sensor** · Very common

## Signs this part is failing

- Open circuit
- Differential drift between the two elements
- Tests OK cold, fails hot

## How it is tested

Measure across the green and white conductors of each thermocouple (4 wires at the plug).

## OEM / factory part numbers

- **AE4M280732**

AGA part numbers change by revision and color — we verify against your serial plate before ordering.

## Series this part fits

- [AGA Classic eR7](https://aga.repair/aga-classic-er7-repair)
- [AGA Classic 39" Total Control](https://aga.repair/aga-classic-total-control-repair)
- [AGA ERA](https://aga.repair/aga-era-repair)

## 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.

## Problems this part solves

- [AGA full power time-out (codes 010–014) — zone too slow to reach temperature](https://aga.repair/aga-full-power-timeout)
- [One cooking zone on an electric AGA is dead or the zone lights flash rapidly](https://aga.repair/aga-tek-zone-dead)
- [AGA thermocouple open circuit or drifting](https://aga.repair/aga-thermocouple-open)

## 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.

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## Book a repair

- Call or text: 206-427-7323 (Mon–Sun 8:00AM–8:00PM, Pacific Time)
- Book online: https://aga.repair/contact/
- Email: service@aga.repair
- Service at your home across the Seattle–Tacoma metro, WA. Diagnostic fee applies toward your repair.

Independent service company — not affiliated with or authorized by AGA / AGA Rangemaster (Middleby). We repair out-of-warranty AGA appliances.