54 MSPA-MP Metapacks Service Manual
Blower Does Not Work!
If blower is not working, carry out the following tests
to correct problem:
To increase the life of the relay, a "snubber" circuit is used on the blower relay.
With this type of circuit, if no blower is connected to an output and relays are open,
the voltmeter will continue to get a voltage reading of around 60 volts. This is normal.
It is important to measure voltage when the blower is connected to the pack.
Power must remain On.
1• Verify if "Blower" indicator
lights up on keypad display
when you press Blower key
(triangular icon will flash when
blower is in low speed).
2• Verify if blower low level pro-
gramming is set correctly.
3• If "Blower" indicator does not
appear on keypad display, then
replace keypad.
4• If "Blower" indicator still does
not appear on keypad display,
then replace board.
Blower
indicator
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