Tankless heater alarm

[JVfromGrnBay]

Several times recently I have heard an alarm from the tankless water heater control panel while I am showering. It is a series of 3 short beeps, repeating approx 7 times. It always stops before I finish my shower so I cannot see any warning light when I check the panel. Any ideas on what this alarm is indicating? 2021 GT 25 FBT

[Bcc75]

Do you turn the water off at the shower head and/ or turn the water almost off?
Either way you would have a minimal flow of water. The tankless heater has to detect a certain amount of flow in order to fire. If not enough flow is detected it will throw a ‘low flow’ alarm. I had this happen while showering and I had the water almost off. My wife was in the bathroom and saw the error code on the panel and I looked it up later. Sure enough that’s what it was.

[JVfromGrnBay]

Each time the alarm has sounded the shower has been at full flow. I typically take a "navy shower" in the trailer and the alarm has been in the rinse phase but yesterday it also sounded briefly in the initial soaping phase.