RTHL3550D1006 - Thermostat HONEYWELL - Free user manual and instructions
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| Product Type | Programmable Thermostat |
| Brand | Honeywell |
| Model | RTHL3550D1006 |
| Color | White |
| Display | Digital LCD |
| Power Source | 2 AA Alkaline Batteries (included) |
| Voltage | 24 VAC |
| Temperature Range | 40°F to 99°F (4°C to 37°C) |
| Programming | 7-Day Programmable with 4 Periods/Day |
| Compatibility | Most 24V Heating/Cooling Systems (Gas, Oil, Electric, Heat Pump) |
| Dimensions (H x W x D) | 4.5 x 3.2 x 1.1 inches |
| Weight | 0.3 lbs |
| Warranty | 1 Year Limited |
| Cleaning | Wipe with dry, soft cloth; do not use solvents |
| Safety | Do not exceed rated voltage; keep away from water |
| Battery Life | Approximately 1 year |
| Setback Range | Up to ±9°F |
| Certifications | UL, CSA |
Frequently Asked Questions - RTHL3550D1006 HONEYWELL
How do I set the time and day on my Honeywell RTHL3550D1006?
Press the Set button until the time flashes. Use the + or - buttons to adjust the hour, then press Set again to adjust minutes. Repeat for day of the week.
Can I use rechargeable batteries?
Yes, you can use rechargeable AA batteries, but note that alkaline batteries are recommended for longer life. Rechargeables may not last as long between charges.
How do I program the thermostat for weekdays?
Press Program until 'Mo' appears. Set the time and temperature for the first period (Wake) using +/-, then press Program to move to Leave, Return, and Sleep. Repeat for each period.
Why is my thermostat display blank?
Most likely the batteries are dead. Replace with two fresh AA batteries. If the display remains blank, check for a blown fuse or tripped circuit breaker in your HVAC system.
How do I reset the thermostat to factory defaults?
Press and hold the Reset button (inside the battery compartment) for 5 seconds using a paperclip. This clears all settings and returns to default programming.
What type of heating/cooling systems is this thermostat compatible with?
The RTHL3550D1006 works with most 24V systems including gas, oil, electric, and heat pumps. It does not support multi-stage or millivolt systems.
How do I set the fan to run continuously?
Press the Fan button to toggle between Auto (fan runs only when heating/cooling) and On (fan runs continuously). The current setting is displayed.
My thermostat shows 'LO' or 'HI' on the display. What does that mean?
'LO' indicates the room temperature is below 40°F (4°C), and 'HI' indicates above 99°F (37°C). This is the measurement limit. Check if the thermostat is placed in an extreme location.
How do I lock the thermostat to prevent changes?
Press and hold the Up and Down arrows simultaneously for 3 seconds until a lock icon appears. Repeat to unlock. This disables all buttons except temperature override.
What should I do if the temperature reading seems incorrect?
First, ensure the thermostat is mounted away from drafts, direct sunlight, and heat sources. Clean the interior gently with a soft brush. If the problem persists, perform a reset or replace batteries.
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USER MANUAL RTHL3550D1006 HONEYWELL
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Product information
Brand : HONEYWELL
Model : RTHL3550D1006
Category : Thermostat