User Guide

ManualsBrandsLaars ManualsBoilersNTH-105 96,000 BTU Neotherm Residential High Efficiency, Wall Mount Heat Only Condensing Boiler (NG)

33

Service Manual NeoTherm 80 - NeoTherm 285

Checking the Air Pressure Switch - Blower Proving Switch

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

Test the air pressure switch.

(See Section B16.)

Switch is OK?

No

Replace switch.

Yes

Problem with

blower?

Yes

See Section B18 -

“Checking the Blower”

No

Heat exchanger

is plugged?

Yes

Clean the heat

exchanger.

See Section C5.

B15