The Intertherm FEHA furnace is a high-efficiency gas furnace designed for residential heating applications. This furnace features advanced combustion technology, multiple safety systems, variable-speed blower motor, electronic ignition, and compatibility with various thermostat systems. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.
Key components: High-efficiency heat exchanger, variable-speed blower motor, electronic ignition system, multi-speed inducer motor, integrated control board, safety switches, and flue gas venting system.
| Feature | Description |
|---|---|
| Heat Exchanger | Stainless steel construction for maximum efficiency and durability |
| Blower Motor | Variable-speed ECM motor for quiet operation and energy savings |
| Ignition System | Hot surface electronic ignition for reliable startup |
| Inducer Motor | Multi-speed draft inducer for proper combustion air flow |
| Control Board | Integrated microprocessor for system monitoring and control |
| Safety Switches | Pressure switches, rollout switches, and high-limit controls |
| Venting System | PVC pipe compatible for sidewall or roof venting |
| Filter System | Standard 1-inch or optional 4-inch media filter capability |
| Gas Valve | Modulating gas valve for precise temperature control |
| Thermostat Compatibility | Works with conventional and programmable thermostats |
Professional installation required. Ensure proper clearances and venting.
WARNING! Installation must be performed by qualified HVAC technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.
Initial startup must be performed by qualified technician.
CAUTION! Never attempt to adjust gas pressure or electrical connections without proper training and equipment.
Integrated control board manages all furnace functions. Status lights indicate system operation and fault codes.
Normal Operation: Thermostat calls for heat → inducer motor starts → pressure switch closes → hot surface igniter heats → gas valve opens → main burner ignition → blower motor starts after heat exchanger warms.
LED Status Codes: Green (normal operation), Red (fault condition - blink pattern indicates specific issue).
Thermostat Settings: Set desired temperature; furnace will cycle automatically to maintain setting.
Regular maintenance ensures optimal performance and safety.
Tip: Keep area around furnace clean and free of combustible materials.
Multiple safety features protect against hazardous conditions.
| Safety Feature | Function |
|---|---|
| Flame Rollout Switch | Detects flame outside combustion chamber |
| High Limit Switch | Prevents overheating of heat exchanger |
| Pressure Switches | Verify proper inducer operation and venting |
| Flame Sensor | Confirms burner ignition; shuts off gas if no flame |
| Gas Valve | Automatic shutoff if ignition fails |
| Condensate Safety | Prevents operation if drain is blocked |
WARNING! Never bypass safety devices. If safety switch trips repeatedly, contact qualified service technician.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Furnace won't start | Power, thermostat, door switch | Check circuit breaker; verify thermostat setting; ensure door properly closed |
| No heat | Gas supply, ignition, filter | Check gas valve; verify pilot/ignition; replace dirty filter |
| Short cycling | Dirty filter, airflow, high limit | Replace filter; check vents and registers; inspect high limit switch |
| Blower runs continuously | Thermostat setting, control board | Check thermostat fan setting; inspect control board |
| Unusual noises | Motor bearings, ductwork, airflow | Lubricate if required; check for loose panels; verify proper airflow |
| Error code flashing | Various system faults | Refer to LED blink pattern in service manual; contact technician if unresolved |
Limited warranty coverage varies by model and installation date.
Warranty requires professional installation and annual maintenance by qualified technician. Keep original receipt and maintenance records.
UL certified; meets ANSI Z21.47 standards for gas-fired central furnaces. CSA certified for Canadian installations. Complies with Department of Energy efficiency standards. Manufactured to meet or exceed all applicable safety and performance requirements.
For service, contact qualified HVAC technician. Have model and serial numbers ready when calling for service.
Model Number: Located on rating plate inside furnace cabinet
Serial Number: Located on rating plate; required for warranty service
Technical Support: Available through manufacturer's website or authorized service centers
Emergency: If you smell gas, leave building immediately and call gas company from outside