8)Freeze Cycle – "GM" and "COMP" LEDs are on. "GM" LED, GMR (X2 on CB), GM, GMPR, and EH continue. "COMP" LED turns on and PDS energizes. Once the refrigeration circuit low-side pressure rises to 29 PSIG, CLPS closes, energizing MC, which energizes Comp and FMR. Ice production begins 4 to 6 minutes after Comp and FMR energize depending on ambient and water conditions.
FS Diagnosis: Check that "COMP" LED is on and that PDS energizes. If "COMP" LED is off, check DC voltage across GMPR terminals 3 and 5 white/orange (W/O) wires.
If 5VDC is present, GMPR contacts are open. Check GMPR solenoid voltage and solenoid continuity. Replace GMPR if necessary. If "COMP" LED remains off, CB is bad and must be replaced. If "COMP" LED is on and PDS is not energized, confirm 115VAC at CB X1 relay brown (BR) to white (W) neutral and CB X1 relay dark blue (DBU) to white (W) neutral. If 115VAC is present on CB X1 brown (BR) and not on CB X1 dark blue (DBU) CB is bad and must be replaced. Next, check for 115VAC from PDS dark blue (DBU) to white (W) neutral. If 115VAC is present and PDS is closed, check for continuity through PDS solenoid. If open or if PDS is sticking closed, replace PDS. SRC Diagnosis: Confirm that CLPS closes. Once CLPS closes, MC energizes, energizing Comp and FMR. If not, check CLPS, SLPS (manual reset), and HPS (automatic reset).
CLPS: When PDS is energized, CLPS closes when refrigeration circuit low-side pressure rises to 29 PSIG. If CLPS is open, check that refrigeration circuit low-side pressure has reached 29 PSIG. If refrigeration circuit low-side pressure is too low, confirm proper TXV operation, check for refrigerant restrictions (drier, PDS), and correct refrigerant charge. Recover, evacuate, and recharge if necessary.
SLPS: If SLPS is open, manually reset SLPS. Confirm proper TXV operation, check for refrigerant restriction (drier, PDS), and correct refrigerant charge. Recover, evacuate, and recharge if necessary.
HPS: HPS automatically resets when refrigeration circuit high-side pressure is within an acceptable range. If HPS does not reset (open), allow pressures to equalize and HPS to reset. If refrigeration circuit high-side pressure does not drop, recover, evacuate, and recharge if necessary. Before restarting unit, check for dirty or clogged condenser. Once unit is restarted, check for proper FMR operation and fan blade for binding. Check for refrigeration circuit refrigerant restriction (receiver, service valves, PDS, and drier). Also check for proper HM operation. If refrigerant pressures have returned to an acceptable range and HPS does not close, replace HPS.
MC: If MC energizes and Comp does not energize, check 208-230VAC at MC T1 black (BK) to MC T2 red (R). If 208-230VAC is not present, check incoming power supply and MC contact continuity. If 208-230VAC is present and Comp does not start, check Comp start relay, start capacitor, run capacitor, and Comp motor windings. If FMR does not energize, check 115VAC at MC T3 dark blue (DBU) to white (W) neutral. If 115VAC is present and FM does not energize, check FM capacitor and motor windings.
