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Service Manual

ManualsBrandsHoshizaki ManualsCommercial EquipmentUR27B-GLP01 27" Steelheart Series ADA Compliant Undercounter Refrigerator with 6.21 cu. ft. Capacity, Glass Door, Door Lock, Energy Star Qualified, R290 Refrigerant and CFC Free Insulation in Stainless Steel
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Table Of Contents
26
3. Defrost
UR/WR Defrost - Possible Cause
1. Control Module (fails to initiate)
See "II.C. Control Module Check"
a) Defective-Cumulative 5-hr. defrost timer fails.
b) Defective-1-hr. defrost lock-out timer fails.
2. Control Module (fails to terminate)
See "II.C. Control Module Check"
a) Defrost thermistor connection loose.
b) Defective.
3. Defrost Thermistor (Conrm DTh
status. See "II.D. Thermistor Check")
a) Defective.
SR and UF/WF Defrost - Possible Cause
1. Control Module (fails to initiate)
See "II.C. Control Module Check"
a) Defective (Cumulative 5-hr. defrost timer fails).
2.
Defrost Safety Thermostat
a)
Defective. Open. Cut-out: 120°F±5°F (49°C±3°C), Cut-in: 70°F±5°F
(21°C±3°C).
3.
Defrost Heater
a)
Defrost safety thermostat open.
b)
Defective.
4. Defrost Thermistor (Conrm DTh
status. See "II.D. Thermistor Check")
a) Defective.
5. Control Module (fails to terminate)
See "II.C. Control Module Check"
a) Defrost thermistor connection loose.