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TROUBLE
Improper Electronic Temperature Control Operation - Zytron Type
1. Low Meter reading with
burner(s) staying on Lo-
Fire.
2. Meter pegged on high
reading - with burner(s)
staying on Lo-Fire.
3. Meter reads correctly but
burner(s) does not cycle to
Hi-Fire in response to con-
trol setting.
4. Meter reading and set
point do not agree.
5. Incorrect meter reading.
6. Incorrect set point.
Improper Moisture Controller Operation - Honeywell UDC 2000
1. IN1RNG Error Message
2. FAILSF Error Message
3. IN1FAIL Error Message
CHECKOUT PROCEDURE & INFORMATION
SHORTED SENSOR CIRCUIT - Disconnect appropriate pair of sensor wires from terminal strip.
Using a VOM tester, test the sensor leads for approx. 1000 ohms resistance (at 70°F). Also test
each lead for continuity to ground, which would indicate a wiring short or failed sensor. If test indi-
cates a SHORTED condition, trace wires back to the sensor and repeat the test. Replace defective
sensor or correct the wiring problem as required.
OPEN SENSOR CIRCUIT - Use VOM and repeat test as described in previous test. If the circuit
tests OPEN (too high a resistance), replace defective sensor or correct wiring problem as required.
SEVERAL POSSIBILITIES - Isolate problem by connecting a jumper wire across the appropriate
relay terminals on controller. If burner will now operate on Hi-Fire, controller or wiring connection is
probably defective.
If burner does not operate on Hi-Fire with jumper connected, check burner for bad Hi-Fire gas sole-
noid valve.
A. If burner remains in Hi or Lo-Fire continuously, check gas pressure and readjust as required.
B. If burner continues to cycle from Hi to Lo-Fire, check dial thermometer for temperature compar-
ative reading. See following problems and corrections.
Check with a 1260 ohm calibration resistor (FF part no. 38-322) as outlined in Bulletin ETS/FC-03-
5. When connected to terminals 10 and 11 of controller, the resistor will cause the thermostat to
switch at 180°F. Readjust METER OFFSET trim pot as required.
Check with calibration resistor as mentioned above, readjust SETPOINT OFFSET trim pot as
required.
SHORTED SENSOR CIRCUIT - Disconnect sensor leads form terminal strip. Using a VOM tester,
test the sensor leads for approx. 100 ohm resistance (at 32°F). If test indicates a SHORTED con-
dition, trace wires back to the sensor and repeat the test. Replace defective sensor or correct the
wiring problem as required.
OPEN SENSOR - Disconnect sensor leads from terminal strip. Using a VOM tester, test the sen-
sor leads for approx. 100 ohm resistance (at 32°F). If the circuit tests OPEN, replace defective
sensor or correct wiring problem as required. Test each sensor lead for continuity to ground. If
continuity is confirmed, replace sensor.
This error message shows whenever the controller goes into a failsafe mode of operation. This will
happen if the controller fails to pass its memory test, configuration tests, or calibration test. Return
controller to the factory for analysis.
Controller has detected two consecutive failures of the input signal. Check for shorted or open
sensor condition as listed above.
63
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