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1. This product contains several interference suppression components, but as an electronic logic
product unpredictable and unusual transients or interferences may sometimes cause strange
results. If this product is acting strange, turn off the source power, count to 10, and reenergize.
2. Terminal blocks are clamp-down type. If there is no wire connected and the screw is loose, the
screw may not necessarily make a good electrical contact to the inside components. Example – if
you are jumpering the thermostat terminals without thermostat wire connection or if you are
attempting to measure voltage on a screw head, you may get erroneous or unpredictable results if
the screw is not tightened down.
3. Use general heating system logic information and basic understanding of the terminal block
wiring functions when measuring voltage to determine proper operation of this module.
Outlet Temperature Sensor
See previous page relating to LED indication and bad sensor operation.
The green LED is an indication that the micro program cannot read a temperature value. This sensor test
or indication does not determine a bad temperature reading, it simply indicates there is software
communication to the sensor itself.
Temperature Sensor Detail
Red wire to J2-1 +5VDC or RED
Black wire to J2-2 DATA or BLK
White wire to J2-3 COM or WHT
Air Filter
A dirty filter can lead to poor system performance and eventual hi-limiting. It is suggested to wash filter
at least twice per year. See Routine Maintenance for instruction on how to wash the filter.
Control Fuse
The low voltage source fuse is a 2A fast blow. A spare fuse is included (next to the operating fuse).
Manual Reset Hi-Limit
Inside the hinged door compartment is a small red button for manually resetting the highest temperature
safety cutout limit. The small red stem will be out approximately ¼", and there is a snap feeling if it was
activated or opened. Using indicator lights, etc. to troubleshoot this manual reset must be carefully
thought through. The four indicators are:
Control board LED, one pulse
SSR (triac) LED will be on
No element amps or current
No heat
COMMENT: A bad SSR (triac) may have the same observation as an activated manual reset,
diagnose carefully.
12/30/2020
Troubleshooting
12
EI916
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