Sterling 682.88107.00 specifications Problem, Possible cause, Corrective action

Problem	Possible cause		Corrective action
	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
	out of the drain line.		the water supply, and clean or
			replace the solenoid.
	Degraded fluid.	Drain and replace fluid.
	Defective heater contactor.		Visual inspection of coil and
			contacts. Repair/replace
			defective contactors.
			Check resistance on all three (3)
	Defective immersion heater.		legs of heater with an ohmmeter.
			If not all equal, contact factory
			for replacement heater.
			Check heater tank for scorched/
Unit does not heat.			discolored paint. Check
	Heater burnout.		resistance on all three (3) legs of
			heater with an ohmmeter.
			Replace heater as needed.
			Check the heater output with an
			ohmmeter to ground. It should
	Controller heater output open.		read in the mega-ohm range.
			Infinite or zero readings indicate
			a defective output.
	Clogged Y strainer.		Clean Y strainer.
	Water supply to unit is turned		Open water supply.
	OFF.
	Water drain is plugged or		Clear drain line or eliminate
	excessive back pressure in drain
			back pressure condition.
	line.
Unit overheats/unable to cool.
	Heat exchanger tubes plugged		Remove tube bundles; clean/
	by lime deposits.		replace as required.
			Test solenoid valve by switching
	Faulty solenoid valve.		to Manual Cool mode and listen
			for valve operation. Replace if
			faulty.

Upright Portable Hot Oil TCUs Chapter 6: Troubleshooting 37