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Old 11-30-2010, 08:46 PM   #1
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Ycd180c4lodd


Keep getting a "Cool Fail" error on the t'stat on several of these units even though the t'stat is set in the Heat position. Trane doesn't have a clue, nor do I. Anyone have an answer

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Old 11-30-2010, 08:54 PM   #2
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Ycd180c4lodd


what kind of t-stat, and model number?

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Old 11-30-2010, 09:00 PM   #3
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It's a Trane Stat, don't know the M/N.
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Old 11-30-2010, 09:04 PM   #4
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Ycd180c4lodd


cant really help you with out the model number... remove the stat from the sub base, and on the back should be a model number, where we could pull up a manual
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Old 12-01-2010, 05:06 PM   #5
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I'll get back to you about that.
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Old 12-13-2010, 07:48 PM   #6
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Ycd180c4lodd


Thermostat is a BAY SEN 019C
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Old 12-14-2010, 06:29 AM   #7
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Quote:
Originally Posted by Bill Edwards View Post
Thermostat is a BAY SEN 019C
Programming and Operation
Trouble Shooting
Problem Solution
Display does not come on.
Check the 24 VAC power supply at terminals 11 and 14 at the Zone
Sensor. Verify that the terminal block is properly positioned on its pins.

No communications to the UCP.
Check for 22 to 32 VDC between terminals 11 and 12 at the Zone Sensor.
Check wiring if no voltage is present.

Displayed Zone Temperature reads Sh and the
COOL FAIL icon is continuiously illuminated.
1. Verify that Option 11 in the Options Menu is set correctly. If correct,
check the wiring from the remote sensor at terminals S1 and S2 for a
shcrted condition.
2. If Option 11 in the Options Menu is set to 0, then the local thermistor is
selected and the on-board thermistor is shorted and the ZSM must be
replaced.

Displayed Zone Temperature reads oP and the
COOL FAIL icon is continuiously illuminated.
1. Verify that Option 11 in the Options Menu is set correctly. If correct,
check the wiring from the remote sensor at terminals S1 and S2 for a open
circuit condition.
2. If Option 11 in the Options Menu is set to 0, then the local thermistor is
selected and the on-board thermistor is open and the ZSM must be
replaced.

Zone Temperature is not displayed. Verify that number 1 has been selected for option 13 in the Options Menu.
ZSM keypad does not respond to selection
Verify that the Keypad is not in the Lockout Mode. Press and hold the TIME
("+") and ("-") Key for 4 seconds to unlock the keypad.

The Clock requires reprogramming after short
power interruptions.
Replace Battery.

FAN Mode is set in the ON position but the Fan
is not running.
Check option 6 in the Options Menu. Refer to the Options Menu section for
option description.

System is operating before the programmed
start time.
Check option 7 in the Options Menu. Computed recovery option overrides
the last part of an unoccupied period to obtain the occupied setting in time.

Buzzer indicates System Failure or Service is
required.
Press the ERASE Key to reset the filter lapse timer. Buzzer will be reset
until noon of the next day if a System Failure has not been corrected.
"99" is Displayed.

Space temperature is above or below the measurable range.
Note: To reset the program and initiate a Self Diagnostic Test; press the PROGRAM KEY, HOLD TEMP KEY, and DAY KEY
simultaniously.
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Old 12-14-2010, 07:33 AM   #8
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Ycd180c4lodd


Quote:
Originally Posted by hvactech126
Programming and Operation
Trouble Shooting
Problem Solution
Display does not come on.
Check the 24 VAC power supply at terminals 11 and 14 at the Zone
Sensor. Verify that the terminal block is properly positioned on its pins.

No communications to the UCP.
Check for 22 to 32 VDC between terminals 11 and 12 at the Zone Sensor.
Check wiring if no voltage is present.

Displayed Zone Temperature reads Sh and the
COOL FAIL icon is continuiously illuminated.
1. Verify that Option 11 in the Options Menu is set correctly. If correct,
check the wiring from the remote sensor at terminals S1 and S2 for a
shcrted condition.
2. If Option 11 in the Options Menu is set to 0, then the local thermistor is
selected and the on-board thermistor is shorted and the ZSM must be
replaced.

Displayed Zone Temperature reads oP and the
COOL FAIL icon is continuiously illuminated.
1. Verify that Option 11 in the Options Menu is set correctly. If correct,
check the wiring from the remote sensor at terminals S1 and S2 for a open
circuit condition.
2. If Option 11 in the Options Menu is set to 0, then the local thermistor is
selected and the on-board thermistor is open and the ZSM must be
replaced.

Zone Temperature is not displayed. Verify that number 1 has been selected for option 13 in the Options Menu.
ZSM keypad does not respond to selection
Verify that the Keypad is not in the Lockout Mode. Press and hold the TIME
("+") and ("-") Key for 4 seconds to unlock the keypad.

The Clock requires reprogramming after short
power interruptions.
Replace Battery.

FAN Mode is set in the ON position but the Fan
is not running.
Check option 6 in the Options Menu. Refer to the Options Menu section for
option description.

System is operating before the programmed
start time.
Check option 7 in the Options Menu. Computed recovery option overrides
the last part of an unoccupied period to obtain the occupied setting in time.

Buzzer indicates System Failure or Service is
required.
Press the ERASE Key to reset the filter lapse timer. Buzzer will be reset
until noon of the next day if a System Failure has not been corrected.
"99" is Displayed.

Space temperature is above or below the measurable range.
Note: To reset the program and initiate a Self Diagnostic Test; press the PROGRAM KEY, HOLD TEMP KEY, and DAY KEY
simultaniously.
Check discharge air sensor, also make sure you have a separate transformer for your zone dampers. This is a complicated system I recommend a pro for this type of zoning. When installed properly it works great. I had a similar problem it turned out to be the discharge sensor. If only one transformer the pull from the dampers can cause this type of problem also.
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Old 12-14-2010, 07:41 AM   #9
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Ycd180c4lodd


Quote:
Originally Posted by Hixheat1

Check discharge air sensor, also make sure you have a separate transformer for your zone dampers. This is a complicated system I recommend a pro for this type of zoning. When installed properly it works great. I had a similar problem it turned out to be the discharge sensor. If only one transformer the pull from the dampers can cause this type of problem also.
Also make sure you are using 18 gauge wires. No wire nuts all wires must be be direct to connection. This a communicating system. If wire nuts are needed the joints must be soldiered. Train should be able to recommend a co. For set up

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