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B2 - troubleshooting the 24v ac power supply, Troubleshooting the 24v ac power supply, See section b2 – LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual User Manual

Page 25: Troubleshooting the 24v ac, Power supply, If breaker trips again, Check the 24v power supply, Shooting the 24v ac power supply

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Service Manual - NeoTherm 500

Troubleshooting the 24V AC Power Supply

B2

24V AC

between TB3

and TB4?

Yes

No

24V AC supply is OK

120V AC

to NT unit?

No

Yes

Troubleshoot the 120V AC

incoming voltage.

120V AC at

main power switch

(3-7 on SW1)?

No

Disconnect power.

Check for continuity through power switch SW1.

Replace if necessary.

Disconnect power.

Check transformer - see Section B34.

Replace if necessary.

Reset

circuit bkr. on

transformer

24V OK now?

Yes

24V AC supply is OK

Why did breaker trip?

Loose or damaged wire?

No

Check

for bad

transformer -

Trans. OK?

Yes

This manual is related to the following products:
See also other documents in the category LAARS Water boiler: