What does E3 error mean on Master Gas Heater?
- RRodney PetersonSep 15, 2025
If the lamp is flickering, and the LED display shows “E3” on your Master Gas Heater, the thermostat switch may have failed. Replace the thermostat switch.
What does E3 error mean on Master Gas Heater?
If the lamp is flickering, and the LED display shows “E3” on your Master Gas Heater, the thermostat switch may have failed. Replace the thermostat switch.
Key hazard warning about potential death, injury, or property loss from heater use.
Heater is not for use in residential living areas or inadequately ventilated spaces.
Explanation of DANGER, WARNING, and CAUTION hazard symbols and their meanings.
Detailed warning about carbon monoxide poisoning, its symptoms, and risks.
Guidance on ventilation requirements, fuel types, and air pollution risks.
Essential safety directives for operation, including unattended use and combustible materials.
Explanation of how fuel is delivered, mixed with air, and ignited.
Description of the fan operation and the temperature limit control.
Minimum distances required from combustibles for safe heater operation.
Diagram and labels for key components of MH-45/75T-KFA models.
Diagram and labels for key components of MH-135T/190T/215T-KFA models.
Table detailing BTU, fuel consumption, tank capacity, pressure, amps, and phase.
Diagrams showing physical dimensions (L, W, H) for different heater models.
Steps to safely remove the heater and packaging materials from the carton.
Table listing required parts for heater assembly, organized by model.
Visual guide to hardware kits and common components used during assembly.
Instructions for attaching the heater's handle and cordwrap.
Step-by-step guide for assembling the heater's frame, axle, and wheels.
Guidance on using 1-K kerosene and other approved fuels for optimal performance.
Guidelines for safely storing kerosene and preventing deterioration.
Precautions and procedures for safely fueling the heater outdoors.
Mandatory ventilation openings for safe operation to prevent CO buildup.
Step-by-step instructions for starting the heater, including thermostat settings.
Procedure for turning the heater off and restarting it after a pause.
Warning about the 5-amp rating limit for the heater's electrical outlet.
Instructions for draining the fuel tank and preparing the heater for storage.
Caution against servicing the heater while it is plugged in or hot.
Recommended cleaning and replacement intervals for filters and fuel tank.
Instructions for cleaning or replacing nozzles and fan blades.
Procedure for cleaning, re-gapping, or replacing the spark plug.
How to clean the photocell and ensure correct positioning for flame sensing.
Instructions for cleaning the fuel filter, varying by model.
How to adjust pump pressure and indicators for optimal pressure.
Table listing correct pump pressure values for each heater model.
Visual representation of heater components with numbered parts for identification.
Table of part numbers and descriptions for each specific heater model.
Electrical schematic detailing the wiring for the MH-45-KFA model.
Electrical schematic detailing the wiring for the MH-75T-KFA model.
Electrical schematic for MH-135T, 190T, and 215T-KFA models.
Solutions for problems like PCB shutdown, flickering lamps, or error codes.
Troubleshooting for no operation, poor combustion, or excess soot production.
Resolving issues with the fan not operating or the heater not turning on.
Details on what the limited warranty covers and common exclusions.
Procedure for making warranty claims and limitations on implied warranties.
| Heater Type | Forced Air |
|---|---|
| BTU Output | 190, 000 BTU |
| Heating Area | 4, 750 sq. ft. |
| Voltage | 120V |
| Frequency | 60 Hz |
| Thermostat | Yes |
| Fuel Type | Kerosene |
| Safety Features | Overheat Shut Off |












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