Groen CC20-E Operator's Manual page 248

Relay Board Prior to Serial
Numbers GC7243MS and
C7439MS.
(Revised 1/02)
This procedure is not required on electronics after serial #
CC10E & CC20E C7439MS CC10G & CC20G GC7243MS
Power Supply Check
When oven power is turned on, there is high voltage
present in the electrical components compartment.
1. Check that relay board ground connection is securely fastened.
2. Turn on oven power.
3. Measure voltage between K16 COM terminal and chassis ground with
a DC voltmeter. The COM terminal is the top terminal as shown in this
illustration. The meter should read a minimum 11 VDC.
Be sure oven is disconnected from branch circuit power
before performing any repair work.
4. If meter reading is 11VDC, or less than 11VDC, disconnect relay board
harness from the control panel and observe meter reading.
5. If voltage reading increases to approximately 20VDC, the control panel
is faulty. Disconnect oven from the branch circuit and replace the
control panel. If voltage reading remains at 11VDC or less, replace
relay board (see page 8-24).
Relay Check
Be sure oven is disconnected from branch circuit power
before performing any repair work.
1. Turn off oven power and check relay board relay coil continuity.
2A. If an open circuit is measured, replace the relay board.
2B. If coil has continuity, refer to the schematic diagram and continuity
check wiring harness. Replace defective wire and/ or wire terminal.
Air, Boiler, and Drain* (Old Electronics Only) Temperature
Probes
Be sure oven is disconnected from branch circuit power before
performing any repair work.
1. Disconnect oven from the branch circuit and remove temperature
probe to be tested. Refer to appropriate replacement procedure in the
Replacement Procedures paragraph.
2. Fill a glass or similar container with ice. Insert at least four inches of air
or boiler probe into the ice. Insert complete drain probe into the ice.
3. Using a digital ohmmeter, measure probe resistance. The resistance
reading should be 500 ±5.0 ohms for all probes except the CC10-E and
CC20-E drain* probe. The resistance of this probe should read 568
±5.0 ohms @ 32°F.
If meter reading is not within this specification, replace the probe.
4. If probe has continuity between the sheath and either probe wire,
replace the probe.
* Drain temperature probe prior to Serial Numbers GC7243MS and
C7439MS.
Maintenance
Test and Adjustments
WARNING
WARNING
WARNING
WARNING
8-3