heat-timer EPU-D, Installation And Operation Manual

Page: 42 / 44

42 EPU‐D Installation and Operation Manual
059840‐00 Rev. A Heat‐Timer Corp.
Too much heat. Incorrect programming. Verify the following settings:
• Ensure the control is not in Bypass mode. See “Bypass
Mode” on page 35.
• Ensure the Day and/or Night Heat Adjustment is not set
too high. See “Day Adjustment” on page 30 and “Night
Adjustment” on page 30.
• If excess heat is only in the morning, ensure the Boost
Adjustment is not set too high. See “Boost Adjustment”
on page 32.
• Ensure the Outdoor Cutoff is not set too high. See “Day
Cutoff” on page 30 and “Night Cutoff” on page 31.
• Ensure the system Setpoint is set correctly. See “System
Setpoint” on page 31.
• Ensure Thermal Lockout is not disabled. See “Thermal
Lockout” on page 32.
Too little heat. Incorrect programming. Verify the following settings:
• Ensure the Day/Night Schedules are set correctly. See
“Day/Night Sch #1 and Day/Night Sch #2” on page 34.
• Ensure the Day and/or Night Heat Adjustment is not set
too low. See “Day Adjustment” on page 30 and “Night
Adjustment” on page 30.
• Ensure the Outdoor Cutoff is not set too low. See “Day
Cutoff” on page 30 and “Night Cutoff” on page 31.
• Ensure the system Setpoint is set correctly. See “System
Setpoint” on page 31.
No heat. Incorrect programming. Verify the following settings:
• Ensure Season is not set to Summer. See “Season” on
page 26.
• Ensure the Outdoor Cutoff is not set too low. See “Day
Cutoff” on page 30 and “Night Cutoff” on page 31.
• Ensure the control Shutdown input is not active. The
display will show “Shutdown Active”.
Defective EPU‐D Control
Module, sensor, or wiring. See “Display shows an incorrect temperature.”
Symptom Possible Cause Recommended Action(s)