PVI Industries PV 500-6 User Manual

DURAWATT

® 

ELECTRIC WATER HEATER 

 

 

 

 

 

ELECTRIC WATER HEATER TROUBLESHOOTING GUIDE 

 

Thermostat(s)   

Check to assure proper thermostat setting. 

Contractors will not pull in 

Check continuity between all three thermostats or pressure 
controls. Complete circuit. If one is open, it must be replaced. 

Control circuit switch is in OFF position 

Close switch. (Turn to ON position) 

Control circuit fuse blown 

Isolate cause for failure and replace fuse. 

Contractor(s) coil open 

Check continuity. Replace coil if not a complete circuit. 

Time delay sequencer not operating 

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. 

Proportional sequencer not operating 

Check for 120 volts to line connection (L) on sequencer. Check 
fuse for continuity. See wiring diagram. Consult factory. 

Low water cutoff open 

Check for open circuit. Check water level in tank. Replace low 
water cutoff if defective. 

Heating elements 

Check for open legs. (See table 2). 

Heater not large enough to satisfy peak 
demands 

Add booster or additional kw input. Consult local PVI 
representative. 

Hot water lines not insulated 

Add insulation; it will protect against heat loss and save on cost 
of operation. 

Power fuse(s) blown 

Check fuses for continuity. Replace if blown. If blown, determine 
cause of break before replacing with same type fuse. 

Contractor(s) not closing 

Check coil for continuity. If defective, replace. 

Thermostat(s)  not correctly set 

Check to assure proper thermostat control setting. 

Element(s) not heating 

Check for proper amperage draw. Check for proper ohm 
resistance. Replace if defective. Consult factory. 
(See table 1) 

Loose connections 

Tighten all connections. If charred, replace wire with wire of 
same type and size. 

Dirty or pitted contactor points 

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. 

Loose connection. Defective element 

Check all connections for tightness. Check ohm resistance in 
electric elements. Replace. 

Local utility 

Check with local utility. 

High or low voltage. Defective element 

Check with local utility. Low amperage, check fuses, tighten 
connections. Check ohm resistance on elements. 

Loose connections. Water leaking on elements 

Tighten connection and replace wire. Isolate leaking water and 
repair. Replace wire with same type and size.