Dacor EORS127 Service Manual page 15

Symptoms
Convection Fan does
not run during Preheat,
Conv Bake, Conv Broil,
Conv Roast (cont.)
Cooling fan does not turn
on at designated turn ON
temperature
Latch motor not running
during Self Clean
All the voltage test points will be at the relay board.
12) If connection is good, disconnect convection fan and measure the
resistance directly. Resistance should be approximately 13 ohms across
the terminals.
13) If convection fan resistance is good, and connections are good then the
convection fan relay is bad. Replace the relay board. Upon replacement
do the same test again.
14) If problem still persists, replace the display board as last resort.
1) Start with a cold oven and run Sabbath mode to turn ON the cooling fan
immediately. If it does not run, measure voltage on the following test
points:
2) Check upper/single cooling fan, Neutral to P11 pin 2 = 120 VAC
upper/single cooling fan.
3) Check lower cooling Fan, neutral to P11 pin 8 = 120VAC (lower cooling
fan).
4) If no voltage for either of the above or cooling fan not running, turn OFF
power and check continuity on following wires:
5) Neutral to NEUT (P6). If no continuity, change wire or wire terminal or
tighten neutral connection on the terminal block.
6) If there is continuity, check resistance on following test points:
7) To check upper/single cooling fan, Neutral - P11 Pin 2 = approximately
18 ohms.
8) To check lower cooling fan, neutral - P11 Pin 8 = approximately 18
ohms.
9) If resistance is high, check continuity on the following wires:
10) Check upper/single cooling fan, P11 Pin 2 to one terminal of the upper
cooling fan.
11) Check lower cooling fan, P11 Pin 8 to one terminal of the lower cooling
fan.
12) Make sure other end of the cooling fan wiring is connected to Neutral. If
properly connected, change the wire or connector or the terminal if no
continuity.
13) If connection is good, disconnect the cooling fan and directly measure the
resistance across the terminals. It should be approximately 18 ohms
across the terminals.
14) If cooling fan resistance is OK and connections are good, then the
cooling fan relay is bad. Replace the relay board. Upon replacement do
the same test again.
15) If problem still persists, replace the display board as last resort.
1) Start Self Clean mode and immediately check to see if the latch motor
runs. If it does not run, measure voltage on the following test points:
2) Check upper/single latch motor: Neutral to P11 Pin 1 = 120 VAC
upper/single cooling fan.
4) Check lower latch motor: Neutral to P11 Pin 9 = 120VAC (lower cooling
fan)
5) If no voltage or latch motor not running, turn OFF power and check
continuity on following wires:
6) Neutral to NEUT (P6). If no continuity, change wire or wire terminal or
tighten neutral connection on the terminal block. Continued...
Section 4 – Troubleshooting Charts
Page 11