CODE

DESCRIPTION

RECOMMENDED TROUBLESHOOTING OF

NOTE

 

 

 

LOCKOUT CODES

 

150

Flame not detected

OEM Specific

H

 

 

1.

Sequence returns to standby and restarts

 

 

 

 

sequence at the beginning of Purge after the HF

 

 

 

 

switch opens. If flame detected during Safe Start

 

 

 

 

check up to Flame Establishing period.

 

151

High fire switch ON

OEM Specific

H or L

 

 

1.

Check wiring and correct any potential wiring

 

 

 

 

errors.

 

 

 

2.

Check High Fire Switch to assure proper function

 

 

 

 

(not welded or jumpered).

 

 

 

3.

Manually drive the motor to the High Fire position

 

 

 

 

and adjust the HF switch while in this position

 

 

 

 

and verify voltage through the switch to the HFS

 

 

 

 

input with a voltmeter.

 

 

 

4.

If steps 1-3 are correct and the fault persists,

 

 

 

 

replace the module.

 

152

Combustion pressure ON

OEM Specific

H or L

153

Combustion pressure Off

1.

Check wiring and correct any errors.

H or L

2.

Inspect the Combustion Pressure Switch to make

 

 

 

sure it is working correctly.

 

 

 

3.

Reset and sequence the relay module.

 

 

 

4.

During STANDBY and PREPURGE, measure

 

 

 

 

the voltage between Terminal J6-5 and L2 (N).

 

 

 

 

Supply voltage should be present. If not, the

 

 

 

 

lockout switch is defective and needs replacing.

 

 

 

5.

If the fault persists, replace the relay module.

 

154

Purge Fan switch On

OEM Specific

H or L

155

Purge Fan switch Off

1.

Purge fan switch is on when it should be off.

H

 

 

156

Combustion pressure and Flame ON

OEM Specific

H or L

 

 

1.

Check that flame is not present in the combustion

 

157

Combustion pressure and Flame OFF

L

 

 

 

chamber. Correct any errors.

 

 

 

2.

Make sure that the flame detector is wired to the

 

 

 

 

correct terminal.

 

 

 

3.

Make sure the F & G wires are protected from

 

 

 

 

stray noise pickup.

 

 

 

4.

Reset and sequence the module, if code

 

 

 

 

reappears, replace the flame detector.

 

158

Main valve ON

OEM Specific

L

 

 

1.

Check Main Valve terminal wiring and correct any

 

159

Main valve OFF

L

 

 

 

errors.

 

 

 

2.

Reset and sequence the module. If fault persist,

 

 

 

 

replace the module.

 

160

Ignition ON

OEM Specific

L

 

 

1.

Check Ignition terminal wiring and correct any

 

161

Ignition OFF

L

 

errors.

 

 

 

 

 

 

2.

Reset and sequence the module. If fault persist,

 

 

 

 

replace the module.

 

162

Pilot valve ON

OEM Specific

L

 

 

1.

Check Pilot Valve terminal wiring and correct any

 

163

Pilot valve OFF

L

 

errors.

 

 

 

 

 

 

2.

Reset and sequence the module. If fault persist,

 

 

 

 

replace the module.

 

66

Page 65 Page 67
Page 66
Image 66
A.O. Smith 1700, 3400, 2600, 2000 instruction manual Inspect the Combustion Pressure Switch to make
Page 65 Page 67

3400, 1700, 2000, 2600 specifications

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