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[Section 5-Troubleshooting ] [ Page 22 ]
2. Door not shut tight
3. Gaskets leaking
4. Check defrost heater operator (if used):
(a) Defective heater
(b) Blown fuse (if used)
(c) Defective "klixon" if used
5. Check defrost settings:
(a) Check defrost thermostat ("St 5") setting
(b) Check defrost differential ("dt 5") setting
(c) Check Defrost Period Switch on main PCB inside control box
(d) Check Defrost Length Switch on main PCB control box.
6. Check that ambient temperature has not exceeded 100°F or 100% humidity.
Display reads - 58° F
1. Thermocouple is "open" :
(a) If food probe, check the make sure it's plugged into probe receptacle properly
(b) Check for loosened thermocouple wire connection at all connections
(c) Check for broken or cut thermocouple wire
(d) Temperature display not believable - responds in reverse:
- Polarity of thermocouple wire is reversed
Evaporator won't run:
1. Breaker not on (if equipped)
2. Motor overload tripped (if equipped)
3. In post-defrost "Drip" period
4. "Fan door" switch is open (if equipped)
5. Blown fuse (if used)
6. Defective contactor (if equipped)
7. Motor defective
Printer problems (if equipped) :
1. Printer doesn't run:
(a) "Link" (jumper) on main PCB not installed
(b) Damaged communications "ribbon" cable
(c) Defective printer
(d) Defective PCB
2. Printer "runs", but no paper comes out:
(a) Check if paper roll is loaded
(b) Check for jammed paper tape -
- Before loading a new roll, make sure free end of tape is pulled
completely away from the roll. Remove any paper residue. (The
residue will undoubtedly result in a paper jam).
- Carefully remove any paper residue from printer platen, otherwise
another jam could occur.
(c) Check for proper tape feed
3. Printer runs, but paper comes out with no printing:
(a) Check if printer has ribbon cartridge installed
(b) Check ribbon - condition may be out of ink, dried out, or torn