Flashing c / C / h / H Anti-short-cycle (3 min) or minimum-run (30 s) timer active

What the control is telling you

A flashing mode letter means the ICC has a call (c = 1st-stage cool, C = 2nd-stage cool, h = 1st-stage heat pump, H = 2nd-stage heat pump) but is holding the compressor on its 3-minute anti-short-cycle timer or 30-second minimum-run timer. Not a fault. Note: some pages of this manual show h1/h2 instead of h/H.

Applies to: (-)PRL-JEC 2-stage 16 SEER heat pumps: RPRL/UPRL-024JEC, -036JEC, -048JEC, -060JEC

Likely causes

• Compressor recently stopped (3-minute delay between compressor runs)
• Call removed less than 30 seconds after start (minimum run timer)

Test and repair steps

1. Wait for the timer to finish; the letter turns steady when the compressor runs.
2. To skip the delay, press TEST for 1 second and release; display shows 't', then compressor and outdoor fan start.
3. If the letter flashes repeatedly with constant short runs, check fault history for code 03 (short cycling).

Settings for these units

Outdoor unit clearances · Rheem/Ruud PRL-JEC heat pump (Comfort Control2 ICC)

Do not reduce the 60 in. discharge or 24 in. service clearances.

Inlet clearances under 6 in. reduce capacity and efficiency.

Models that show this code

4 models in Rheem/Ruud PRL-JEC heat pump (Comfort Control2 ICC)

Other codes on the same units

• d4 Memory card invalid for device
• d8 Old shared data
• L4 Locked rotor lockout
• L6 Open start circuit lockout
• L7 Open run circuit lockout
• L21 Low pressure control lockout
• L29 High pressure control lockout
• P Compressor protector trip