Symptom

 

Possible Causes

Corrective Actions

4.

Pilot sparks, but pilot will

A.

Correct gas supply.

Verify that incoming gas line ball valve is “open”. Verify that inlet pressure

 

not light.

 

 

reading is within acceptable limits, inlet pressure must not exceed 14 in. w.c.

 

 

B.

Ignitor gap is too large.

Verify that spark gap from ignitor to pilot hood is .17 in. or 1/8 in.

 

 

 

 

 

 

 

C.

Module is not grounded.

Verify module is securely grounded to metal chassis of appliance.

 

 

D.

Module voltage output/

Replace module.

 

 

 

valve/pilot solenoid ohms

 

 

 

 

readings.

 

Heatilator • Novus BV-Mesh4031-553 Rev F • 11/07

37

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Heatiator NB3630MI, NB4236MI, NB4842MI, NB3933MI owner manual Symptom Possible Causes Corrective Actions

NB3933M, NB3630M, NB3630MI, NB3933MI, NB4236M specifications

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