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Troubleshooting
Models C708/C709/C716/C717
Solenoid Valve Failure Troubleshooting
These hot gas units were tested to determine symptoms exhibited by the units when the solenoid valves fail. The
following are the test results.
Barrel Hot Gas Solenoid Valve
a. Stuck Closed: Will cause a failure of the heat cycle, heat phase.
b. Stuck Open/Leaking: Will cause a failure of the heat cycle, cool phase.
Product in the barrel will not freeze down to temperature, or if frozen at time of
malfunction will cause poor product quality. The initial draw with compressor off will
be sloppy.
Suction Pressure will be high (about 5 psi [35 kPa] above setting).
Hopper Hot Gas Solenoid Valve
a. Stuck Closed: Will cause a failure of the heat cycle, heat phase.
b. Stuck Open/Leaking: Will cause a failure of the heat cycle, cool phase.
Will warm product in the hopper above acceptable level.
Pressures: Suction was 30 psi (207 kPa), discharge was 175 psi (1,207 kPa).
Barrel Suction Solenoid Valve
a. Stuck Closed: Product will not freeze properly in Auto, and will fail heat cycle.
Compressor Will Fail Suction pressure dropped to DBV setting and discharge psi also dropped.
Compressor sump temperature rose to 200°F (93°C) in 30 minutes.
b. Stuck Open/Leaking: Product in barrel will cool while the hopper cools with the beater off. The belt is
squealing, and there is low suction psi.
Will not cause a heat cycle failure but will be an issue after long hopper cooling
period in Standby after heat cycle.
Barrel Liquid Solenoid Valve
a. Stuck Closed: Product will not freezer down in the Auto mode or cool in the Standby mode.
Compressor Will Fail Suction pressure was in a vacuum, discharge pressure was 175.
The compressor cut out on internal overload in 9 minutes.
b. Stuck Open/Leaking: Will fail the heat cycle in the heat phase.
The product will be cold and lumpy, and there will be poor ejection.
Hopper Liquid Solenoid Valve
a. Stuck Closed: Will fail heat cycle, cool phase. Product will not cool in Auto or Standby modes.
Suction pressure is below DBV setting with hopper only cooling.
b. Stuck Open/Leaking: Will fail the heat cycle in the heat phase.
In Auto or Standby modes, the hopper product cools to 32°F (0°C).
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