Over 600 Resideo controls and parts — the Honeywell Home product line under its current name. Thermostats, gas valves, ignition assemblies and components, aquastats and wells, zone valves and actuators, pressure relief valves, switching relays, transformers, fan and limit controllers, sensors and low water cut-offs.
Most of what is here is a replacement part, and Resideo parts are model-specific. Gas valves and ignition assemblies in particular are matched to the appliance and often to a serial range within one model, because the manufacturer revises the component without changing the appliance name. Order from the data plate, not from the appliance description.
Two things that decide the right part. Voltage: low-voltage (24V) controls drive a system through a transformer and relay and cover most gas and hydronic equipment, while line-voltage switches 120V or 240V directly and belongs to electric baseboard and radiant — connecting one to the wrong system is a fire risk, not a malfunction. And an aquastat has to be paired with the correct immersion well, seated to the bottom with conducting paste, or it reads the air in the well and responds late.
Working from an older Honeywell part number? The model numbering carried over when Resideo was spun off in 2018, so a number from an old manual will usually identify a current part. See the Honeywell to Resideo part number cross-reference for the full series index — L, V, VR, Q, ZD, TH and the rest, and where each sits in the catalog.
Browse Resideo controls by function
Hydronic zoning
Valve-zoned systems change the hydraulics as zones close, so most failures show up at the powerhead rather than the valve body. Replacement heads swap without draining the system.
- Zone valves — all types
- 2-way zone valves
- 3-way zone valves
- High-head zone valves
- Fan coil zone valves
- Zone valve replacement heads
- Zone valve parts
- Zone dampers
- Forced air zone panels
Boiler and hydronic controls
The aquastat and its immersion well are ordered together — well length and bulb diameter have to match, and the sensor seats to the bottom of the well.
- Aquastats and wells
- Pressure reducing valves
- Thermostatic mixing valves
- Air separators
- Boiler trim kits
- Thermostatic radiator valves
- Radiator valves
Gas and ignition
These are the parts most often ordered wrong. Match the gas valve and ignition assembly to the appliance data plate, including the serial range.
- Furnace and boiler gas valves
- Gas ignition components
- Pilot, burner and ignition parts
- Thermocouples and thermopiles
- Oil burner controls
Thermostats
Check voltage before anything else: 24V low-voltage for gas and hydronic equipment, line voltage for electric baseboard and radiant.
- Thermostats — all types
- Non-programmable thermostats
- Programmable thermostats
- Smart thermostats
- Line voltage thermostats
- Thermostat accessories
- Thermostat wire
Relays, transformers and switching
Air and water
