What changed at the unit?
Heat pump has no hot water: safe next steps
When the kitchen and bathroom taps both stay cold, begin at the controller—not inside the cabinet. Copy the display, note when hot water stopped and read the full model number only if its label is safe to reach. Those facts help with support; they do not identify a failed component.
Observed symptom ≠ diagnosed fault
What this can tell you
Cold water confirms the symptom, not the failed part
Cold water from the kitchen, shower and laundry confirms a whole-home hot-water problem, but it does not identify the failed part. Recent demand, the controller state and the exact unit design all change what a licensed technician or manufacturer support team needs to consider.
Keep the unit closed and treat any controller wording as evidence to record, not an invitation to test internal parts. A source-backed code match can narrow the correct manual and support route without claiming a remote diagnosis.
Four checks, then a route
Choose a clear next step
Are any danger signs in the red safety panel present?
Stop using the unit and follow the urgent licensed or emergency route in that panel.
Is the controller showing a code or written message?
Copy every letter and number exactly, then enter it in the search on this page.
Can the brand and complete model number be read without opening anything?
Use the brand directory to reach the matching model page and recorded official support.
Is there still no documented route, or is hot water still unavailable?
Arrange licensed repair help and share the notes gathered below.
Letters or numbers on the controller?
Copy the display before choosing support
If the display contains a code or message, search it with the brand or model. Codes are matched only to documented controller scopes; a similar-looking code from another unit is not treated as evidence.