GE Heat Pump Water Heater Completely Dead After Less Than 6 Months - Looking for Diagnostic Help

I’m looking for advice from anyone familiar with GE heat pump water heaters, particularly the newer GE Appliances models.
Model: PH65S10BPY01
Age: Less than 6 months old
Purchased: January 2026
Failure Date: May 31, 2026
The unit has completely stopped producing hot water and GE has not yet been able to determine a definitive root cause.
Current Symptoms
No hot water at all.
Hot and cold water temperatures are essentially identical.
Water heater is cold to the touch.
Brass outlet valve is cold to the touch.
SmartHQ app shows 0 gallons of hot water available.
Energy usage in the app appears to have remained at 0 since May 31, when the failure occurred.
Unit has been placed in High Capacity Mode for testing with no change in operation.
App unexpectedly switched from Fahrenheit to Celsius.
Current error codes include:
F16
F20
F21
F50
Service History
The situation has become increasingly confusing.
Initially:
Parts were ordered.
A technician later determined the wrong parts had been shipped.
Additional parts were ordered.
I was later told those parts were backordered and GE was attempting to source them directly from the factory.
More recently:
GE reviewed the MAC ID data remotely.
I was told the sensor appears to be functioning normally.
I was asked to place the unit in High Capacity Mode and monitor it.
After more than five hours in High Capacity Mode:
Still no hot water.
Unit still cold.
App still shows 0 gallons available.
Parts Situation
This is now the third separate parts order associated with the repair.
First parts shipment arrived later than promised. Two heating elements and TCO WFS17X22383
Second parts order was reportedly unavailable after being ordered.
Third parts orders was promised today by noon but doesn’t show that it’s been picked up yet. Temperature sensor assembly ws17x22385, TCO WS17X22386
The latest technician visit resulted in numerous additional parts being ordered.
Current estimated delivery date is June 29, nearly 30 days after the original failure.
At this point I have very little confidence that anyone has identified the actual root cause of the failure.
Questions
For anyone who services these units:
Do these error codes point to a known failure pattern?
Is there a component that would explain all of these symptoms simultaneously?
Has anyone seen a unit show zero energy consumption while still appearing operational in the app?
Does the addition of the F50 code help narrow the diagnosis?
Is there anything I can check myself before the next technician visit?
Has anyone seen a unit require this many parts without a definitive diagnosis?
I’ve documented the entire process, including 13 customer service contacts, multiple technician visits, and multiple parts orders. GE has been actively involved, but before more parts get thrown at this unit I’d love to hear from anyone who has actually repaired one of these systems.
Any insight would be greatly appreciated.