The Dayton High Efficient Furnace Model 3438B is a high-efficiency gas furnace designed for residential heating applications. This model features advanced combustion technology, electronic ignition, multi-speed blower motor, built-in safety controls, and energy-efficient operation. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.
Key components: High-efficiency heat exchanger, electronic ignition system, multi-speed blower, integrated control board, gas valve, pressure switches, flame sensor, and limit switches.
| Feature | Description |
|---|---|
| Heat Exchanger | Stainless steel secondary heat exchanger for maximum efficiency |
| Ignition System | Hot surface electronic ignition |
| Blower Motor | Multi-speed ECM motor for variable airflow |
| Control Board | Integrated microprocessor for system control |
| Gas Valve | Modulating gas valve for precise temperature control |
| Pressure Switches | Safety switches for combustion air verification |
| Flame Sensor | Monitors burner flame presence |
| Limit Switches | High-temperature safety cutoffs |
| Venting | PVC pipe compatible for sidewall or roof venting |
| Efficiency Rating | 95% AFUE or higher |
Unpack and inspect all components. Ensure proper clearances and venting requirements.
WARNING! Installation must be performed by qualified HVAC technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.
Initial startup and system configuration by qualified technician.
CAUTION! Only qualified technicians should perform initial setup and adjustments.
Integrated control board with status LED and diagnostic capabilities. Thermostat controls heating cycles and fan operation.
Control Board LED: Flashing patterns indicate system status and error codes.
Operation: Thermostat calls for heat → Inducer motor starts → Pressure switch verification → Hot surface ignition → Gas valve opens → Flame sensor verification → Blower motor starts after heat exchanger warm-up.
Settings: Blower off-delay, heating speeds, diagnostic mode, lockout reset.
Regular maintenance required for optimal performance and safety.
Tip: Keep area around furnace clean and unobstructed.
Multiple safety systems protect against hazardous conditions.
WARNING! Never bypass safety controls. If safety switches trip repeatedly, contact qualified technician.
| LED Flash Pattern | Error Code | Description |
|---|---|---|
| 1 flash | Pressure switch error | Check inducer and venting |
| 2 flashes | Ignition failure | Check gas, ignition, flame sensor |
| 3 flashes | Limit switch lockout | High temperature condition |
| 4 flashes | Flame rollout | Check burners and heat exchanger |
| 5 flashes | Gas valve error | Check wiring and gas valve |
| 6 flashes | Blower error | Check blower motor and capacitor |
| 7 flashes | Control board error | Replace control board |
Turn off power before cleaning. Keep furnace area clean and dry.
CAUTION! Do not use water or liquid cleaners. Use vacuum with soft brush attachment for dust removal.
UL listed and ANSI certified. Complies with applicable safety standards. Installation must comply with local building codes, National Fuel Gas Code (NFPA 54), and National Electrical Code (NFPA 70). For support, contact Dayton Technical Support at 1-888-DAYTON1 or visit www.dayton.com.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Furnace won't start | Power, thermostat, door switch | Check circuit breaker, thermostat setting, door switch engagement |
| No heat | Gas supply, ignition | Verify gas valve on, check for ignition attempts |
| Short cycling | Dirty filter, airflow | Replace filter, check for blocked vents/registers |
| Blower won't stop | Thermostat, control board | Check thermostat fan setting, control board relay |
| Unusual noises | Motor, blower wheel | Inspect blower assembly, motor bearings |
| Error code flashing | System fault | Refer to error code chart; reset if safe |
Reset: Turn power off for 30 seconds, then restore.
Service: 1-888-DAYTON1; www.dayton.com