Sterling 6017 series installation manual Troubleshooting

7	Troubleshooting
Condition	Possible cause	Solution
	Undersized connectors/lines.	Increase size of connectors/
		water lines.
	Long connecting lines between	Move the unit closer to the mold
	unit and mold.	and shorten connecting lines.
	Serpentine flow through mold.	Connect lines for parallel flow
		instead of series flow.
	Blocked line in mold.	Check mold for metal chips or
		deposits. Clean mold.
Temperature fluctuations/rapid
	Quick disconnect fitting with	Remove and replace fitting or
cycling from hot to cold.	check valve.	valve.
	Carbon build-up in unit piping or	Clean or replace affected piping.
	fittings.	Replace fluid.
		Check unit by opening the
	Faulty Sterlco TCU.	manual bypass to determine if
		the TCU contols the set point
		temperature.
	Reversed probes.	Switch Return and Delivery
		probes.
	Loss of fluid in process.	Check all lines/connections/
		fittings.
	Vent valve open.	Allow vent timer to run out; or,
		check valve operation when unit
Unit does not heat properly/can		is cold by opening the fill port.
		Switch to Manual Cool mode
not achieve set point.	Faulty/dirty solenoid valve;	several times to flush valve. If
	usually detected when there is a	the leak continues, disconnect
	steady stream or trickle of water	the power to the unit, turn off the
	out of the drain line.	water supply, and clean or
		replace the solenoid.
	Degraded fluid.	Drain and replace fluid.
		Visual inspection of coil and
	Defective heater contactor.	contacts. Repair/replace
		defective contactors.
		Check resistance on all three (3)
		legs of heater with an
Unit does not heat.	Defective immersion heater.	ohmmeter. If not all equal,
		contact factory for replacement
		heater.
		Check heater tank for scorched/
		discolored paint. Check
	Heater burnout.	resistance on all three (3) legs
		of heater with an ohmmeter.
		Replace heater as needed.

Page 52 6017 Series Hot Oil Large Temperature Control Units