Troubleshooting; Technical Support - EWC Controls ULTRA-TALK 3000 Technical Bulletin

SYMPTOM
Cooling will not run at all. Zone
thermostat displays E11 fault code.
LCD & LED's are responding
properly.
HVAC system does not always respond
properly. Periodic Comm errors are displayed
on thermostats. BIAS voltage measures
0.6vdc or less than 0.6vdc on the system data
wires.
LCD & LED's function and HVAC
system functions normally but
dampers do not respond.
LCD & LED's do not function and
HVAC system does not respond.
Time Delay is Active
and won't allow Heat
or Cool to Function.
DETECTING 24vac SHORTS
HVAC system not responding and
UT3000 LED's are off.
One or more thermostats will not
power up and/or show a display.
ISOLATING 24vac SHORTS
140mA, 350mA & 100mA circuit
breakers protect the UT3000 and
react to a short in the Thermostat or
Damper Motor field wiring.
Detecting 24v shorts to common or shorts to earth ground
When the 2.5A (F1)breaker is tripped it will get hot to the touch! The LCD and the LED's will not illuminate!
To reset the breaker, locate the short by removing each hot wire connected to the panel, one at a time. When the
shorted wire is removed, the panel will resume normal functions. Now you must repair or replace the shorted wire. If
one or more 140mA, 350mA or 100mA breakers trip, only the device(s) connected to that block will be affected.
Remove each hot wire connected to that block until the voltage is restored. Find and repair the shorted wires or
device before re-connecting the wires. If there is a short between the Data 1 & 2 wires or if the Data wires are shorted
to 24v or earth ground, the communicating thermostat on that zone will alert you by displaying "Call for Service". If
a non- communicating thermostat is connected and a short occurs on the 24v wires, the thermostat will not power up
and that zone will not function. Find and repair the short using the methods described above.
EWC Controls provides superior toll free Troubleshooting Support for the UT3000 when you are on the job site!
®
Call 1-800-446-3110 Monday - Friday 8am to 5pm EST. Otherwise call 1-732-446-3110 for information on the UT3000 and
other ULTRA-ZONE products. Visit our web site to download this Technical Bulletin and other related information at
®
www.ewccontrols.com
When calling for Technical Support from the job-site, please have a good quality multi-meter, pocket screwdriver,
and wire cutters/strippers on hand.
Copyright © 03/14/2023 EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
T R O U B L E S H O O T I N G
SOLUTIONS
Some HVAC systems require a "System Test" prior to normal operation.
Access the Zone 1 thermostat and perform the System Startup T est.
Clear all fault codes in the Outdoor and Indoor unit diagnostic menu folders.
Access the Zone 1 thermostat and initiate System Charge mode.
The preferred BIAS voltage is 0.6vdc - 1.2vdc. Less than 0.6vdc is unstable.
Check BIAS DC voltages:
BIAS dip switches (#1 & #2) at the bottom of the UT3000, should be set to ON.
Use 2 wires each on Data 1 & Data 2, going to the Outdoor communicating unit.
Check damper motor wiring for proper connections. Too many or incompatible
dampers connected to a single zone. Check damper motor 24volt output. Test
wires for Continuity/Shorts. Check damper motor wiring for shorts/miswiring.
Refer to Page 15 of the Technical Bulletin for Damper Wiring.
Check HVAC & UT3000 system transformer supply voltage.
Check HVAC & UT3000 system 24vac transformer voltage/fuse/breakers.
Test all wires for Continuity, shorts to 24v Common or shorts to earth ground.
Check HVAC & UT3000 system wiring for shorts and miswiring.
Back
When Troubleshooting, Simultaneously Press the Back & Forward buttons for 1
Forward
second to Bypass any Active Time Delay.
CHECK YOUR WIRING
SYMPTOM: Entire Panel or a Single Zone appears to be dead!
If 24vac short has occurred, 24vac will be present at the UT3000 24v Input
terminals R & C, but 24vac will not be present at any thermostat R&C terminals.
SOLUTIONS:
breaker to cool! Find and repair short(s) in thermostat field wiring. Restore 24 vac power.
SOLUTIONS: Disconnect the wire(s) from the 'R' terminals on the UT3000
thermostat terminal blocks , and the "C/PO/PC'' terminals on the UT3000 damper
motor terminal blocks. Restore power. If the short is no longer present, Ohm out
the thermostat and damper field wiring for continuity, shorts to common and/or
shorts to earth ground. Replace or repair wires as necessary. Restore power.

TECHNICAL SUPPORT

Data 1 to C = 2.8 & Data 2 to C = 2.2
Remove wires from thermostat terminal blocks and allow 140 or 350mA circuit
or
Data 1 to C = 1.9 & Data 2 to C = 1.3.
E-Mail- info@ewccontrols.com
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