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TROUBLESHOOTING & FREQUENTLY ASKED QUESTIONS
In case of difficulty, try one of the following suggestions below.
Symptom
If display screen is blank
If keys do not allow manual entry
Service Menu does not display
SETBACK is in the Display
Dashes in the Temperature Display
Err In Clock Dispay
Door in Clock Display
Fdd in Clock Display
If no heating or cooling is running, but there is a call
for heat or cool (Heat/Cool appears on display) in
Auto mode
If heating or cooling system doesn't respond
If heating and cooling equipment are running at the
same time
If Demand Indicator light is red
If Demand Indicator light is green
Fan outputs turned off after 3-minutes
Menu Item Not available
Red LED is Flashing and a code is displayed in the
clock location
UL60730-1 Required Information:
Purpose of control: Operating Control,Room Thermostat
Type 1.C Action
Pollution Degree 2
Impulse Voltage: 2500 V
© COPYRIGHT 2023 PECO, INC. ALL RIGHTS RESERVED.
Potential Cause(s)
• Thermostat is not being powered
• Default Display is set to "4" (None)
• Keypad Lockout may be enabled
• PIN access is enabled
• Buttons were not pressed simultaneously
• System is in setback
• Remote Probe Error
• Indicates a service fault input
• Door or window is open
• Indicate an economizer or other system fault
• Heating or cooling equipment is not operating
• Minimum off time has not been met
• Power Jumper is not located properly at
terminal TB2.
• System type selection is incorrect
• System type selection is incorrect
• Verify wiring connections
• Heating is occurring
• Cooling system is running
• Pipe sensor is connected and water
temperarture between hot water and cold water
set points
• Some service menus are disabled when not in
use or feature is not available.
• Fault is present on TB1-3 and TB1-7
• Probe is not wired correctly or is wrong value.
8
Solution
• Check to assure proper wiring of power to the thermsotat.
• Check power to verify that there is power (24-277 VAC) available.
• Check Service Menu 520.
• Access Service Menu 340. Within this menu, select option "0" to assure
there is no keypad lockout (so manual entry is enabled).
• Access requires the three digit code set by the installer.
• Wait for unit to return to default display and retry.
• Your thermostat has an occupancy detection system connected.
• Check connections between TB1-5, TB1-6, TB1-7
• For remote probe use allow 5 minutes for thermsotat temperature to
stabalize.
• Check Service Menu 170 for correct selection.
• Indicates service is required.
• Close door and /or window to clear fault.
• Indicates service is required.
• Check Service Menu 110 to assure that the correct option is selected to
match the system type.
• Check wiring, using output tests to verify (see Service Menus 600, 610,
620).
• Verify that the Power Jumper is in the correct position for your system
voltage. CAUTION: Do not move the Power Jumper to 24VAC position if
your system is running at line voltage.
• Check Service Menus 110 and 120 to assure that the correct option is
selected to match the system type.
• Check Service Menu 110 to assure that the correct option to match the
system type is selected
• Separate the heating and cooling wires, using output tests to verify (see
Service Menus 600, 610, 620).
• No action is required.
• No action is required.
• Building Boiler or Chillers may be turned off.
• See Service Menus 171, 172, 173 & 174
• Verify system type selection and feature selection is correct.
• Check SM175 for code
• If using a remote sensor, verify probe wiring and type.
P/N 74150 3220-2384 REV 04
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