Computer Control Models Only - Vulcan-Hart ML-126743 Service Manual

VC4E & VC6E Series Full Size Electric Convection Ovens - TROUBLESHOOTING
SYMPTOMS
Intermittent operation problems.
No power to oven controls.
No heat, convection fan motor runs.
No power to temperature control.
Door does not seal or shut properly
SYMPTOM
Oven does not heat.
High limit thermostat shutting OFF heat.
Oven not hot enough.
F25105 Rev. B (0217)

COMPUTER CONTROL MODELS ONLY

Page 62 of 64
POSSIBLE CAUSES
1. High ambient temperatures.
2. Wiring connections loose.
3. Cooling fan malfunction.
1. Main circuit breaker OPEN.
2. Control circuit fuses OPEN.
3. Power switch (S1) inoperative.
4. Transformer (T2) inoperative (480V only).
1. High limit thermostat OPEN.
2. Heating element malfunction.
3. Contactor malfunction.
4. Temperature control malfunction.
1. Power switch (S1) in "Cool Down".
2. Door or door switch open.
1. Doors out of adjustment.
2. Door chain out of adjustment or broken
(simultaneous doors).
3. Door catch roller out of adjustment or broken
(independent doors).
4. Door seals damaged.
POSSIBLE CAUSES
1. High limit switch open.
2. Temperature probe malfunction.
3. Computer control malfunction.
1. Temperature probe malfunction.
2. Computer control malfunction.
1. Temperature probe malfunction.
2. Computer control range high (rH1) setting to low.
See SETUP MODE under COMPUTER CONTROL.
3. Computer control malfunction.