RT-SVX23D-EN 53
Trouble Shooting
Method 1
If the Zone Sensor Module (ZSM) is equipped with a remote panel with LED status indication, you
can check the unit within the space. If the ZSM does not have LED’s, use Method 2. BAYSENS110*,
BAYSENS109*, BAYSENS119*, & BAYSENS023A all have the remote panel indication feature. The
LED descriptions are listed below.
LED 1 (System)
“On” during normal operation.
“Off” if a system failure occurs or the LED fails.
“Flashing” indicates test mode.
LED 2 (Heat)
“On” when the heat cycle is operating.
“Off” when the heat cycle terminates or the LED fails.
“Flashing” indicates a heating failure.
LED 3 (Cool)
“On” when the cooling cycle is operating.
“Off” when the cooling cycle terminates or the LED fails.
“Flashing” indicates a cooling failure.
LED 4 (Service)
“On” indicates a clogged filter.
“Off” during normal operation.
“Flashing” indicates an evaporator fan failure
Below is the complete listing of failure indication causes.
System failure
Check the voltage between terminals 6 and 9 on J6, it should read approximately 32 VDC. If no
voltage is present, a System failure has occurred. Refer to Step 4 in the previous section for the
recommended troubleshooting procedure.
Cooling Failure
1. Cooling and heating set point (slide pot) on the zone sensor has failed. Refer to the “Zone
Sensor Test Procedure” section.
2. Zone temperature thermistor ZTEMP on ZTS failed. Refer to the “Zone Sensor Test Procedure”
section.
3. CC1 or CC2 24 VAC control circuit has opened, check CC1 & CC2 coils, and any of the controls
below that apply to the unit (HPC1, HPC2).
4. LPC1 has opened during the 3 minute minimum “on time” during 4 consecutive compressor
starts, check LPC1 or LPC2 by testing voltage between the J1-8 & J3-2 terminals on the RTRM
and ground. If 24 VAC is present, the LPC’s has not tripped. If no voltage is present, LPC’s has
tripped.
Service Failure
1. If the supply fan proving switch has closed, the unit will not operate (when connected to RTOM),
check the fan motor, belts, and proving switch.
2. Clogged filter switch has closed, check the filters.
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