SECTION 12: TROUBLESHOOTING

RED, 8 flashes:

Lockout- Pressure switch

 

failed to operate or modulation

 

current was incorrect.

 

Condition could be caused by:

 

• Pressure Sensor

 

• Pressure Switch

 

(faulty or hoses reversed)

 

• Gas Valve Modulation Coil

 

• Wire Harness (6 wire)

RED, 9 flashes:

Lockout- Air Supply.

 

Condition could be caused by:

 

• Blower

 

• Pneumatic Conections to

 

Pressure Sensor

 

• Blockage in flue or inlet

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Aiko CTH3-115, CTH3-150, CTH3-80, CTH3-200 service manual Troubleshooting