Gas Valve Diagnostic Codes (See Figure 44)

OFF

 

 

 

 

=

Control

not

powered

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heartbeat

 

 

 

 

=

Normal

Operation

 

(Standby

or

call for heat)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Flash

 

 

 

 

=

Not

used

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

Flashes

 

 

 

 

=

Pressure

switch

closed

when

should

be open

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

Flashes

 

 

 

 

=

Pressure

switch

circuit

was

still

sensed

as

open

30

seconds

after

the inducer

was

energized.

System is

in 5 minute

 

delay mode,

with inducer

off.

After

5-minute

delay,

a new

ignition

sequence

will

 

be

initiated.

 

 

 

 

 

 

 

 

 

 

 

 

(Note: SV9541M On/Off switch in off position during a call for heat will generate this diagnostic code)

4

Flashes

 

 

 

 

=

Limit

switch

string

open

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

Flashes

 

 

 

 

=

Flame sensed

out

of sequence

 

- Flame

signal

still

present.

 

 

 

 

 

 

 

 

 

 

6

Flashes

+

1

Note

1

=

Soft

Lockout

 

-Maximum

 

retry

count

exceeded

(failed

to

light

within

4 trials

for

ignition)

 

 

 

6

Flashes

+

2

Notes

1,2

=

Soft

Lockout

 

-Maximum

 

recycle

count

exceeded

-

Last

failure

was Flame Sense Lost During Run

6

Flashes

+

3

Notes

1,2

=

Soft

Lockout

 

-Maximum

 

recycle

count

exceeded

-

Last

failure

was

Airflow

Proving

Circuit

Opened

 

 

 

 

 

 

 

During

Run

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

Flashes

+

4

Notes

1,2

=

Soft

Lockout

 

-Maximum

 

recycle

count

exceeded

-

Last

failure

was

Limit

Circuit Opened

During

Run

7

Flashes

 

 

 

 

=

Soft

Lockout

 

Due

 

to Limit

Trips

 

Taking

Longer

than

2

minutes

to

Reset; Auto

Reset

After

1

Hour

if

 

 

 

 

 

 

 

Call

for

Heat

 

Still

 

Present.

 

Reset

by

Cycling

Call

for

Heat

at

Any

 

Time.

 

 

 

 

 

 

NOTE 1 : 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. When the 6+ X code is flashing, the SV9541 will attempt a new ignition sequence after a five minute delay period, if the call for heat is still present. Reset of the thermostat will initiate a new ignition sequence immediately.

NOTE 2: Any combination of 5 'abnormal' events during a single call for heat will result in soft lockout. An 'abnormal' event is a Flame Sense Failure During Run, Airflow Proving Circuit Open During Run, or Limit Circuit Open During Run. The flash code will indicate which was the last 'abnormal' event that put the system into the soft lockout state based on the table above.

Typical Gas Valve Honeywell

OUTLET

PilotPressure

A_ustment(Hidden)

On\Off

INLET

Manifold Pressure

Adjustment

Diagnostic Light

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[_

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Image 42
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