B19 - checking the air pressure switch, Checking the air pressure switch, Blower proving switch – LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual User Manual
Page 48: See section b19, Checking the air, Pressure switch, If the pressure switch remains open, go to sec, Tion b19, “checking the air pressure switch, See procedure b19
38
Service Manual - NeoTherm 500
Exhaust vent
blocked?
Yes
No
Clear the vents.
Check the bird screens
or terminals.
Check for blocked air intake
and exhaust vents.
Clean with a shop-vac.
Dirty fan?
Yes
No
Switch is OK?
No
Replace switch.
Yes
Problem with
blower?
Yes
No
Heat exchanger
is plugged?
Yes
B19
Checking the Air Pressure Switch - Blower Proving Switch
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