With new heater and new control and all sensors and wires testing fine why when set dry we get no heat ?

I’m reaching out regarding an Electrolux dryer that continues to have no heat even after multiple verified repairs and full diagnostic testing. The customer has already replaced the heater assembly and the control board with new OEM parts, but the unit still will not produce heat.

We are experienced technicians and performed a full diagnostic process on-site. Here is what we have verified:

• 240V supply is present at the wall outlet and at the dryer terminal block.
• High-limit thermostat, blower thermostat, thermal fuse, and thermistor all test within proper ohm range and show correct continuity.
• New heater assembly ohms within spec and does not show any short to ground.
• Drum motor runs normally, airflow is good, and no mechanical issues are present.
• Wiring harness inspected with no visible damage or burnt connections.

This heater uses a 3-terminal configuration, with Yellow and Gray on the left side and Black on the right side.

With the unit running and the drum spinning, we measured the following:

Yellow to ground: 120V

Gray to ground: 120V

Black to ground: 120V

However:

There is no 240V between any combination of these heater terminals (Yellow–Black, Gray–Black, or Yellow–Gray).

Even with a new heater and new control board, and with all sensors and safety devices testing within spec, the heater never receives full 240V across its terminals. This results in zero heat.

We have used test mode and no codes or issues
We have followed wire schematics and troubleshooting trees as well

To summarize:

All thermostats and sensors test correctly.
New heater & new control board installed.
Heater ohms correctly and is not grounded.
Proper incoming voltage confirmed.
Motor runs normally.
Heater receives 120 to ground off all 3 legs
But the heater never receives 240V across any of its three legs.

At this point my only thought is it appears that the L2 path through the heating circuit (possibly the motor centrifugal switch or an internal harness issue) is not being completed, but we would like confirmation on expected voltage readings and proper test points for this specific 3-terminal heater layout.
As well as any more help you could provide to.solve this

Any documentation or guidance to help verify the issue here would be greatly appreciated so we can finalize this repair for the customer.

Thank you,