TROUBLESHOOTING

 

INTEGRATED FURNACE

GUIDE

 

CONTROL MODULE

 

 

 

 

 

 

 

 

 

 

CHART 4

4A4E

Main Burner

Ignition Check.

Inducer ON.

Does ignitor

YES

warm up and

 

glow?

 

NO

4B

Turn power OFF to furnace.

Unplug ignitor from wire

harness. Connect voltmeter

across ignitor wiring harness leads from control. Energize system.

Does burner

YES

ignite?

 

NO

4F

Is gas

valve manual NO knob in ON position?

4G YES

Turn manual knob to OFF position. Connect manometer to outlet pressure tap. Turn knob to ON position. Energize system.

Turn manual knob

to ON position.

Check operation.

Purge system of

air. Energize

system. Check

operation.

 

 

4C

4H

 

4I

 

 

 

Is outlet

 

 

 

 

 

 

Refer to service

Replace ignitor.

 

Is 120V

pressure

 

YES

YES

facts or installer’s

present at

detected after

Check operation.

 

 

guide for proper

 

ignitor leads?

ignitor warm-

 

 

 

 

pressure settings.

 

 

 

up time?

 

 

 

 

 

 

 

 

NO

NO

 

 

 

 

 

 

4J YES

Is manifold

pressure

adjusted to

required setting?

NO

4K

Is gas at source?

Adjust manifold

to required

NOpressure setting.

Check operation.

4D4L

YES

Replace broken or

 

Is 120V

YES

present at

defective wiring.

control terminals

 

Check operation.

 

IGN & IGN

 

 

NEUTRAL?

 

 

NO

Connect voltmeter

to gas valve

leads. Energize

system.

4M

Is 24V

detected

across gas

valve leads after

ignitor warm-

up time?

 

 

 

Restore gas

 

 

 

supply at source.

 

 

 

Check operation.

 

4N

 

 

 

Is 24V

 

 

 

present

 

Replace control

NO

across control

NO

 

MV terminals after

 

module. Check

 

ignitor warm-

 

operation.

 

up time?

 

 

 

YES

Replace control.

Replace gas

valve. Energize

Check operation.

system. Check

 

operation.

YES

Repair or

replace broken

leads to gas valve.

Check operation.

TECHNICAL HELP

!WARNING

If diagnostic indicator (LED)

shows continuous flashing, turn off gas supply at source before disconnecting electrical power!

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Emerson 50A55 manual 4G YES

50A55 specifications

The Emerson 50A55 is an advanced digital thermostat designed to enhance home comfort with energy-efficient climate control. This state-of-the-art device combines modern technology with user-friendly features, making it an ideal solution for both residential and commercial applications.

One of the main features of the Emerson 50A55 is its versatile programming capability. The thermostat supports a 5-2 day programming structure, allowing users to customize their heating and cooling schedules to fit their lifestyle. Users can set different temperatures for weekdays and weekends, ensuring that energy is not wasted when homes are unoccupied.

Another prominent characteristic of the Emerson 50A55 is its intuitive touch-screen interface. The large, easy-to-read display allows users to navigate through settings seamlessly. The interface includes large buttons and clear icons, enhancing the overall user experience. Additionally, backlighting ensures visibility in low-light conditions, making adjustments easy at any time.

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In conclusion, the Emerson 50A55 digital thermostat is a comprehensive solution for those looking to improve their home heating and cooling efficiency. With its programmable features, user-friendly interface, and energy-saving technologies, it delivers both convenience and performance. This makes it an excellent investment for anyone aimed at achieving a comfortable indoor environment while reducing energy costs.