Troubleshooting - PVI PV 500-6 Installation And Maintenance Manual

TROUBLE PROBABLE CAUSE
Thermostat(s)
Contractors will not pull in
Control circuit switch is in OFF position
Control circuit fuse blown
Contractor(s) coil open
No hot water
Time delay sequencer not operating
Proportional sequencer not operating
Low water cutoff open
Heating elements
Heater not large enough to satisfy peak
demands
Hot water lines not insulated
Insufficient hot
Power fuse(s) blown
water
Contractor(s) not closing
Thermostat(s) not correctly set
Element(s) not heating
Loose connections
Burned or
discolored wires
Dirty or pitted contactor points
Blown fuses Loose connection. Defective element
High or low
Local utility
voltage
High or low
High or low voltage. Defective element
amperage
Wire burned
or melted at Loose connections. Water leaking on elements
element
PV500-6 09/07
DURAWATT
ELECTRIC WATER HEATER TROUBLESHOOTING GUIDE
®
ELECTRIC WATER HEATER
Check to assure proper thermostat setting.
Check continuity between all three thermostats or pressure
controls. Complete circuit. If one is open, it must be replaced.
Close switch. (Turn to ON position)
Isolate cause for failure and replace fuse.
Check continuity. Replace coil if not a complete circuit.
Check for 120 volts to coil on first sequencer step. Allow ample
time for additional steps to energize. If steps do not energize in
reasonable time, replace only the defective relay step. See
wiring diagram.
Check for 120 volts to line connection (L) on sequencer. Check
fuse for continuity. See wiring diagram. Consult factory.
Check for open circuit. Check water level in tank. Replace low
water cutoff if defective.
Check for open legs. (See table 2).
Add booster or additional kw input. Consult local PVI
representative.
Add insulation; it will protect against heat loss and save on cost
of operation.
Check fuses for continuity. Replace if blown. If blown, determine
cause of break before replacing with same type fuse.
Check coil for continuity. If defective, replace.
Check to assure proper thermostat control setting.
Check for proper amperage draw. Check for proper ohm
resistance. Replace if defective. Consult factory.
(See table 1)
Tighten all connections. If charred, replace wire with wire of
same type and size.
Remove contactor points and inspect. If dirty, clean with emery
paper. CAUTION: Point must remain flat. If pitted or burned,
contractor points must be replaced.
Check all connections for tightness. Check ohm resistance in
electric elements. Replace.
Check with local utility.
Check with local utility. Low amperage, check fuses, tighten
connections. Check ohm resistance on elements.
Tighten connection and replace wire. Isolate leaking water and
repair. Replace wire with same type and size.
REMEDY
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