HVACopediaRheem · Heat pump · Startup
Compressor start protection and status display
What happens, in order
- ICC needs 24 V on R and C plus line voltage for the compressor and outdoor fan
- With no command it shows 0 (standby)
- A call for compressor operation lights the red Y1 LED
- Outdoor fan and compressor run with a 1 s on/off delay per stage
- Low pressure control is ignored for the first 90 s of compressor run (and during defrost)
- A 3 minute anti-short-cycle timer holds the compressor off between runs; the display flashes the mode letter while the timer is active
- Display letters c first stage cool, C second stage cool, h first stage heat, H second stage heat, d defrost
Timings and thresholds
| Item | Value |
|---|---|
| Anti-short-cycle timer | 3 min |
| Low pressure control ignored at start | 90 s |
| Fan on/off delay | 1 s per stage |
Codes you may see during this
Applies to: Rheem PRL-JEC heat pump
Models
More Rheem heat pump sequences
- Demand defrost cycle · Defrost
Related
Rheem error codes · Rheem tips · Rheem parts · All Rheem sequences
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Source: PRL-JEC heat pump installation instructions, ICC Control Operation. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.