Vulcan-Hart VHX24E service manual Troubleshooting, Boiler Base Controls, Symptom Possible Causes

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VHX SERIES STEAMER - TROUBLESHOOTING

TROUBLESHOOTING

BOILER BASE CONTROLS

SYMPTOM		POSSIBLE CAUSES

Steamer does not operate, low water light	1.	Main circuit breaker off; or control circuit fuse F1 or F2 open.
and high pressure lights not lit.	2.	Supply voltage incorrect.
	3.	Supply voltage transformer - jumper missing or incorrect
		location; or transformer inoperative.
	4.	Power switch malfunction.

Steamer on, cannot reset low water	1.	Boiler fill water off or filtering system clogged.
condition. Low water light lit, ready light	2.	Boiler blowdown/drain valve stuck open or malfunction.
not lit, water level not visible in sight glass.	3.	Manual blowdown valve open on water level probe housing.
	3.	Manual blowdown valve open on water level probe housing.
	4.	Lime scale build-up on water level probes.
	5.	Water level control board - ground connection open, not
		receiving power or malfunction.
	6.	Boiler fill valve clogged or malfunction.
	7.	Auxiliary water level control board - ground connection open,
		not receiving power or malfunction.
	8.	Reset switch malfunction.
	9.	K1, K3 relays not seated properly or malfunction.
	10.	Water too pure for probes to properly conduct electricity.
	11.	Interconnecting wiring malfunction.

Steamer on, cannot reset low water	1.	Ground connection open on auxiliary water level control board.
condition. Low water light lit, ready light	2.	Lime scale build-up dried on AUX LLCO probe.
not lit, water level visible in sight glass.	3.	Auxiliary water level control board not receiving power or
	3.	Auxiliary water level control board not receiving power or
		malfunction.
	4.	Reset switch malfunction.
	5.	K1, K3 relays not seated properly or malfunction.
	6.	Interconnecting wiring malfunction.

Steamer on, cannot reset high pressure	1.	Cycling pressure switch out of adjustment or malfunction.
condition. High pressure light lit, pressure	2.	High limit pressure switch out of adjustment or malfunction.
gauge indicating 15PSI.	3.	Reset switch malfunction.
	3.	Reset switch malfunction.
	4.	K2, K4 relays not seated properly or malfunction.
	5.	Steam trap malfunction.
	6.	Interconnecting wiring malfunction.

Boiler operates but pressures are below	1.	Manual blowdown valve on water level probe housing open.
the normal cycling range of 10-12 PSI.	2.	Boiler blowdown valve clogged and not fully closing.
	3.	Supply voltage incorrect.
	4.	Cycling pressure switch out of adjustment or malfunction.
	5.	Heating elements not wired correctly.
	6.	Contactor(s) malfunction.
	7.	Heating element malfunction.
	8.	Steam trap malfunction.
	9.	Excessive load on boiler due to other equipment connected to
		steam line (outlet from boiler).

F25154 (February 2004)		Page 42 of 48

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Contents VHX Boiler Base Series High Efficiency Electric Steamer VHX24E ShownTable of Contents VHX Series Steamers INSTALLATION, Operation Cleaning Introduction GeneralModel Number of Pans PAN Depth PER Compartment Inches Boiler Code Descriptions SpecificationsWater Conditioning Boiler PressureStandard ToolsElectrical SpecialRemoval and Replacement of Parts Pressure Switch Control BOX ComponentsMain Control BOX Components Water Level Gauge Assembly Left Side View ShownHeating Elements Heating Element Mounting Plate Heating ElementsBoiler Assembly Right Side View ShownDescaler Cathodic Protector Gasket Cooking Compartment DoorsRemoval HandleLatch Assembly Service Procedures and Adjustments BoilerWater Level Probe Housing Blowdown Water Level Controls TestMain Water Level Control Auxiliary Low level Cut-Off Control Cycling Pressure Switch Adjustment High Limit Pressure Switch Adjustment Boiler Fill and Cold Water Condenser Solenoid ValvesCold Water Condenser Thermostat Adjustment Intake Shut-Off Valve Adjustment Steam Flow Heating Element TestCooking Compartment Door Sealing Adjustment Door Latch AdjustmentComponent Function Reset Switch ManualElectrical Operation Cold Water CondenserCompartment Pressure Switch Blowdown/DrainSteam Solenoid Valve Component Locations Boiler Base ControlsBoiler Base Controls Cooking Compartment Controls Water Level Controls Low Level Cut-Off & Differential ControlAuxiliary Low Level Cut-Off Layout, Legend & Diagnostic Test Points Relay BoardSchematic Sequence of Operation Initial Fill and PreheatWater Refill After Initial Fill Boiler Blowdown/drainVHX Series Steamer Electrical Operation Schematics Cooking Compartment Controls Wiring Diagrams VHX Series Steamer Electrical Operation Heating Element Circuits Cooking Compartment Controls Troubleshooting Symptom Possible CausesBoiler Base Controls Symptom Possible Causes Symptom Possible Causes Cooking Compartment Controls VHX Series Steamer VHX Series Steamer Condensed Spare Parts List VHX24E, VHX24E5, MHB24EPart Number Description