The White Rodgers UP400 is a programmable thermostat for low voltage heating and cooling systems, compatible with single-stage heat/cool, heat-only, cool-only, gas/oil/electric furnaces, hydronic zone heat, and central air conditioning. It features 5+2 day programming with 4 periods per day, automatic/manual changeover, battery backup (2 AA batteries), and adjustable cycle rates. Powered by 24 VAC; compatible with systems up to 1.5A per terminal, 1.5A max total. Below are the key specifications, installation, operation, programming, and troubleshooting instructions.
Assemble tools: hand or power drill with 3/16 inch drill bit (if needed), flat blade screwdriver, wire cutter/stripper, level, voltmeter. Shut off power to the heating and cooling system at the main fuse or circuit breaker box until installation complete. Label wires before disconnecting. Verify package contents: Wallplate (A), Thermostat (B), White cover (C), 4 color inserts (D), Clear plastic cover (E), 2 mounting screws and wall anchors (F), Wire Labels, Installation Instructions and User Guide. This thermostat is for low voltage systems only; not for line voltage. Install away from drafts, direct sunlight, or heat sources for accurate sensing.
Pre-Installation Checklist:
WARNING! Failure to read and follow all instructions carefully before installing or operating this control could cause personal injury and/or property damage. Save these instructions.
The thermostat is a programmable device for heating and cooling with separate weekday/weekend programs. It supports auto-changeover, emergency heat for heat pumps, and energy management features like price display, estimated bill, and usage information.
Applications: Programmable heating and cooling schedules; energy management with hourly/critical peak pricing; override critical events (with caution); filter maintenance reminder (FLTR display); troubleshooting common issues.
CAUTION! The thermostat may stop controlling temperature and your house may freeze or overheat when batteries are too low. Batteries must be changed when "BATT" appears on the display.
ATTENTION: MERCURY NOTICE This product does not contain mercury. However, this product may replace a product that contains mercury. Mercury and products containing mercury must not be discarded in household trash. Do not touch any spilled mercury. Wearing non-absorbent gloves, clean up any spilled mercury and place in a sealed container. For proper disposal of a product containing mercury or a sealed container of spilled mercury, place it in a suitable shipping container. Refer to www.White Rodgers.com for location to send product containing mercury.
| Feature | Description |
|---|---|
| Power | Powered by indoor air handler or 120V outlet (gas furnace) |
| Accuracy | ±1.0°F |
| Battery Backup | Maintains time and temperature during power loss |
| Display | Alternates time and temperature setpoint |
| Modes | HEAT, COOL, AUTO, EMER (heat pumps), OFF |
| Programming | 5+2 day, 4 periods/day |
| Other | Auto-changeover, filter reminder, energy info |
Remove old thermostat: Turn off power, expose wires, label wires (RH, RC, W, Y, G, O/B), disconnect wires, remove base. Install new wallplate: Mark holes, drill/anchor, secure wallplate, connect wires to terminals (R to R, W to W, Y to Y, G to G, O/B to O/B). Install 2 AA batteries, snap thermostat to wallplate. Restore power.
| Terminal | Wire Label | Connect To |
|---|---|---|
| R | RH, RC, 4, V | R |
| W | W, H | W |
| Y | Y, C | Y |
| G | G, F | G |
| O/B | O, B, X | O/B |
Note: If old thermostat had jumper between RH and RC, connect R wire to R terminal. For heat pumps, O/B wiring depends on heat/cool active.
Power on. Set SYSTEM to HEAT, FAN to AUTO, adjust setpoint 3°F above room temp; heat should activate. Lower to 3°F below; heat stops. Repeat for COOL. For fan: FAN to ON, fan runs; FAN to AUTO, fan stops.
CAUTION! Do not operate below 50°F.
Non-programmable thermostat. Use presets for Home/Sleep/Away. Manual setpoint adjustment for custom temperatures.
Set ELEC/GAS switch (GAS for gas/oil, ELEC for electric). Select cycle rate: Fast (default) or Slow (SL) for hydronic systems. Configure filter reminder and keypad lockout via menu.
| Option | Default | Description |
|---|---|---|
| Cycle Rate | Fast | Set to Slow for hydronic heating |
| ELEC/GAS | GAS | GAS for gas/oil, ELEC for electric |
| O/B | O | O for cool, B for heat (heat pumps) |
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Display blank or erratic | Voltage spike/static discharge | Reset: Move SYSTEM to OFF, press all three buttons, then move to HEAT while holding buttons |
| Heating/cooling not working | Incorrect wiring or switch settings | Verify wire connections and switch settings (FAN, SYSTEM, ELEC/GAS, O/B) |
| Fan not operating | FAN switch set to OFF | Set FAN switch to AUTO |
| Filter reminder appears | Filter needs replacement | Replace air filter in HVAC system |
| Temperature display inaccurate | Factory calibration drift | Adjust displayed temperature using calibration feature |