Brown and Son WA Cooler & Freezer manual Refrigeration Trouble Shooting Guide

Refrigeration Trouble Shooting Guide

Always use a certified trained Refrigeration Technician when repair of your refrigeration system is required.

Malfunction	Possible Cause	Solution
Compressor will not start - no hum	Service cord unplugged	Plug in service cord
	Fuse blown or removed	Replace fuse
	Overload tripped	Determine reasons and correct
	Control stuck open	Repair or replace
	Wiring incorrect	Check wiring against diagram
Compressor will not start - hums but	Improperly wired	Check wiring against the diagram
trips on overload protector	Low voltage to unit	Determine reason and correct
	Staring capacitor defective	Determine reason and replace
	Relay failing to close	Determine reason, correct or replace
Compressor starts & runs, but short	Low voltage to unit	Determine reason and correct
cycles on overload protector	Overload defective	Check current, replace overload protector
	Excessive head pressure	Check ventilation or restriction in system
	Compressor very hot-return hot gas	Check refrigerant charge, fix leak if req ‘d
Compressor operates long or continuously	Short of refrigerant	Fix leak, add charge
	Control contact stuck	Repair or replace
	Evaporator coil iced	Determine cause, defrost manually
	Restriction in refrigeration system	Determine location & remove
	Dirty condenser	Clean condenser
Compressor runs fine, but short cycles	Overload protector	Check wiring diagram
	Cold control	Differential too close-widen
	Overcharge	Reduce charge
	Air in system	Recover and recharge
	Undercharge	Fix leak, add refrigerant
Starting capacitor open, shorted or blown	Relay contacts stuck	Clean contacts or replace relay
	Low voltage to unit	Determine reason and correct
	Improper relay	Replace
Relay defective or burned out	Incorrect relay	Check and replace
	Voltage too high or low	Determine reason and correct
Refrigerated space too warm	Control setting too high	Reset control
	Refrigerant overcharge	Recover refrigerant
	Dirty condenser	Clean condenser
	Evaporator coil iced	Determine reason and defrost
Standard temperature system freezes	Control setting is too low	Reset the control
the product	Control points stuck	Replace the control
Objectionable noise	Fan blade hitting shroud	Reform/cut away small section of shroud
	Tube raffle	Locate and reform
	Vibrating fan blade	Replace fan blade
	Condenser fan motor raffles	Check motor bracket mounting, tighten
	General vibration	Compressor suspension bolts too tight
	Worn fan motor bearings	Replace fan motor

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