Honeywell TH9421 Owner's Manual - Page 29

In case of difficulty - problems

Get Honeywell TH9421 PDF manuals and user guides View all Honeywell TH9421 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 29 highlights

In case of difficulty VisionPRO® IAQ If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily. Display is blank • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on. • Make sure furnace door is closed securely. No response to key presses (or temperature will not change) • Check to make sure the thermostat is not locked (see page 26). Make sure heating and cooling temperatures are set to acceptable ranges: • Heat: 40° to 90°F (4.5° to 32°C) • Cool: 50° to 99°F (10° to 37°C) Backlight is dim • A dim display is normal. See Advanced function 0280 on page 22 for backlight options. "Err" appears on screen • Contact your contractor. Your equipment may need service or repair. 27 69-1815EFS-06

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
VisionPRO
®
IAQ
27
69-1815EFS—06
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
•
Check circuit breaker and reset if necessary.
•
Make sure power switch at heating & cooling system is on.
•
Make sure furnace door is closed securely.
No response to
key presses (or
temperature will
not change)
•
Check to make sure the thermostat is not locked (see page 26).
Make sure heating and cooling temperatures are set to acceptable ranges:
•
Heat: 40° to 90°F (4.5° to 32°C)
•
Cool: 50° to 99°F (10° to 37°C)
Backlight is dim
•
A dim display is normal. See Advanced function
0280
on page 22 for
backlight options.
“Err” appears
on screen
•
Contact your contractor. Your equipment may need service or repair.
In case of difficulty