Sterling Water Heater Benutzerhandbuch

 

(Available online at www.sterlco.com) 

 

Part No:  682.92594.10 

No power. 

Check main disconnect, fuses, wiring, and 
power lead to unit. 

Wrong voltage supplied to unit.  

Voltage must be within plus or minus 10% of 
nameplate rating. 

Defective on/off switch. 

Replace. 

Control circuit fuse blown. 

Replace. 

Unit does not turn on 

Defective control transformer. 

Check transformer. 

Broken or loose wire in pump motor control circuit. 

Locate and repair. 

Pump motor contactor holding coil is open. 

Repair or replace. 

Low water pressure light on.  

Check for at least 16 psig (110.32 kPa/1.1 
bars) water pressure on WATER IN or CITY 
WATER MAKEUP. 

Water supply to unit is turned off. 

Open water supply. 

Unit does not run 

Pump overload light on. 

Reset and test each leg for balanced amp 
draws. 

Undersized connectors/ water lines. 

Increase size of connectors/ water lines. 

Long connecting lines between unit and mold. 

Move the unit closer to the mold and shorten 
connecting lines. 

Serpentine flow through mold. 

Connect lines for parallel flow instead of 
series flow. 

Blocked water line in mold. 

Check mold for metal chips or lime buildup. 
Clean mold. 

Quick disconnect fitting with check valve. 

Remove and replace fitting or valve. 

Temperature fluctuations/ 
rapid cycling from hot to 
cold. 

Lime buildup in unit piping. 

Clean or replace. 

Drain is plugged or excessive back pressure is in drain 
line. 

Clear drain line or eliminate back pressure 
condition. 

Faulty solenoid valve. 

Test solenoid valve by pressing VENT 
button and listen for valve operation. 
Replace if faulty. 

Controller Cool output relay open. 

Replace output relay. 

Solenoid valve is not operating, but COOL LED is on. 

Set process temperature to minimum and 
check for magnetism on solenoid coil top. 

Solenoid coil circuit is open. 

Check coil resistance. If M

Ω range, replace 

solenoid coil. 

Modulating valve is not operating, but OUT2 LED is on. 

Set process temperature to minimum and 
check for complete travel of valve. 

Insufficient pressure differential between cooling 
WATER IN and OUT lines. 

Find a means to get less back pressure in 
the WATER OUT line. 

Unit overheats or does not 
cool 

Cooling valve is undersize. 

Replace cooling valve with a larger valve. 

Defective heater contactor. 

Visually inspect coil and contacts; 
repair/replace defective contactors. 

Defective immersion heater. 

Check resistance on all three (3) legs of the 
heater with an ohm meter. If not all equal, 
contact factory for replacement heater. 

Heater contactor is not energizing, but HEAT LED is on.

Set process temperature to maximum and 
check for control voltage at heater contactor. 

Unit does not heat/cannot 
achieve set point 

Faulty/dirty solenoid valve. 

Press VENT button several times to flush 
the valve.