Thermo Pride Gas/Propane Furnace Induced Draft Highboy/Counterflow/Horizontal MHA1 User Manual

Page 49

All installations and services must be performed by qualified service personnel.

Yes

After pre-purge,does the

hot surface ignitor energize

and glow?

Yes

After hot surface ignitor

warm-up, does gas valve

open?

Yes

Check the ignition control module

diagnostic LED lamp. Reset the

module by interrupting power to

system for more than one second.

If LED stays on continuously, replace

ignition control module.

Check wiring to draft inducer.

If okay, replace inducer assembly.

Is there 120 VAC across draft

inducer power terminals "IND"

& "IND N" at the ignition control

module?

Check wiring to hot surface

ignitor. If okay, replace hot

surface ignitor assembly.

Check wiring to gas valve.

If okay, Replace gas valve.

Check across "MV" terminals

on ignition control module for 24

VAC during the 4 second flame

proving period after ignitor

warm-up. Is there 24 VAC?

Is there voltage present at the

hot surface ignitor terminals

"IGN" & "IGN N" at the ignition

control module?

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