Sears N9MP1, N9MP2 Honeywell SV9541M Smart Valve Trouble shooting, Flashes + SoftLockout

Models: 9MPD N9MP1 N9MP2

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HONEYWELL SV9541M "SMART VALVE" Trouble shooting

The 6 + X designation

indicates

a combination

of flash

codes: 6 flashes

shows

the control

is in soft

lockout, followed by X flashes to

indicate the reason

the control

went into soft

lockout.

Last status code

indicates

repair to

address

first

LED

 

 

 

CHECK/REPAIR

 

 

INDICATES

 

 

 

 

STATUS

Off

Heartbeat Bright - Dim

2 Flashes

3 Flashes

No power to system control.

Normal indication whenever the system is powered, unless some abnormal event has occurred.

Pressure switches closed when it should be open

(i.e. when call for heat begins),

(Combustion blower is not energized until pressure switches opens)

Pressure switches, open when they should be closed (i.e. longer than 30 seconds after combustion blower/inducer is energized).

System goes into 5-minute delay period, with combustion blower/ inducer off. At end of the 5-minute delay, another cycle will begin.

Main Limit or Roll Out Switch is open.

Line voltageinput at L1 and Neutral connectors on ST9160B Fan Timer. Low voltage (24V) power at 24 VAC and COM terminals on ST9160B System wiring harness is in good condition and securely connected.

Net Applicable - Normal Operation (stand by or call for heat)

Pressure switches stuck closed (system will wait for pressure switch to open).

Pressure switches miswired erjumpered.

Ignition system control switch must be in the ON position. Pressure switches operation, tubing, and wiring. Restrictions in furnace air intake or vent piping.

Main limit switch.

Manual reset burner rellout switch.

4Flashes

5Flashes

6Flashes +

1 Flash

Combustion blower is energized, Circulating blower is energized heat speed.

Flame signal sensed out of proper sequence.

Combustion blower is energized, Circulating blower is energized heat speed after the "ON" delay.

Soft Lockout.

Failed to light pilot during 90 sec. trial for ignition

Combustion air blower is de-energized, Circulating blower is de- energized after the "OFF" delay.

After 5-minute delay time, control system will reset and initiate a new ignition sequence,

Limit and rellout switch wiring is in good condition and securely connected.

Flame at pilot burner.

Gas supply off or pressure too low or high for appliance to operate. Damaged or broken HIS element

Line voltage HOT lead wire not connected to L1 terminal on ST9160B. Furnace not properly earth grounded.

Flame sense rod contaminated or in incorrect position. Pilot burner located in incorrect position.

Pilot burner lead wires are in good condition and popery connected. Pressure switches operation, tubing, and wiring.

6Flashes +

2Flashes

SoftLockout.

Last failure was Flame Sense lost during run.

Maximum recycle count exceeded

Combustion air blower is de-energized, Circulating blower is de-energized after the "OFF" delay.

After 5-minute delay time, control system will reset and initiate a new ignition sequence,

Gas supply off or pressure too low or high for appliance to operate. Line voltage HOT lead wire not connected to L1 terminal on ST9160B. Furnace not properly earth grounded.

Flame sense rod contaminated or in incorrect position. Pilot burner located in incorrect position.

Pilot burner lead wires are in good condition and properly connected.

Cycling, pressure switch

Condensate drain blocked

Pressure switches operation, tubing, and wiring.

44001 1114O0

[_

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Sears N9MP1, N9MP2, 9MPD manual Honeywell SV9541M Smart Valve Trouble shooting, Flashes + SoftLockout, Check/Repair

9MPD, N9MP1, N9MP2 specifications

The Sears N9MP2, N9MP1, and 9MPD are prominent models in the realm of residential heating systems, specifically designed to provide efficient and effective heating solutions. These models are part of Sears' commitment to quality and innovation, making them a popular choice among homeowners seeking reliability and performance.

The N9MP2 is a high-efficiency multi-speed gas furnace that boasts an impressive AFUE (Annual Fuel Utilization Efficiency) rating. This feature allows the furnace to convert a significant portion of fuel into usable heat, which effectively translates to lower energy bills for homeowners. The unit is equipped with a two-stage gas valve that provides increased comfort by adjusting the heating output based on demand, ensuring an even temperature throughout the home.

The N9MP1, like its counterpart, is known for its reliability and efficiency. It offers a single-stage operation that is ideal for homes needing consistent heating without the necessity for the more complex stages present in two-stage systems. This model also has a good AFUE rating, making it a cost-effective solution for families looking to reduce their heating expenses. Its design is tailored for easy installation and maintenance, allowing homeowners to keep their heating systems running at optimal performance without hassle.

The 9MPD model takes a step further with its advanced technology integration. It features a sophisticated control board that allows for easier diagnostics and enhanced system management. The 9MPD is also designed with quiet operation in mind, employing advanced sound-reduction technologies to minimize noise levels during heating cycles. Homeowners will appreciate the peace and quiet it brings, particularly in shared living spaces.

All three models are equipped with high-quality insulation and specialized heat exchangers that enhance their thermal efficiency. Additionally, they are designed with safety features such as automatic shut-off systems and robust flame rollout protection, ensuring a safe heating experience.

In terms of characteristics, these models are generally constructed with durable materials, designed to endure harsh weather conditions while providing consistent heating. They can be connected to various home automation systems, which adds to their appeal for tech-savvy consumers.

In conclusion, the Sears N9MP2, N9MP1, and 9MPD represent a comprehensive lineup of reliable, efficient, and technologically advanced heating systems suitable for contemporary homes. Their dedication to performance ensures that homeowners enjoy a warm and energy-efficient environment throughout the chilly seasons.