5-10 min · 9 steps
R-290 Case Controller / Config Fault
Walk a self-contained R-290 case that's off temperature or alarming when the sealed system and fans check out — setpoint, probe, and defrost configuration.
First step
Is the controller showing a probe/sensor alarm (P1/P2, E0, 'Er') or fault code?
Yes — a probe/sensor alarm is shown
No — no alarm, just off temperature
This is a preview of the first step. Run the full interactive diagnostic free — it walks you all the way to the likely root cause.