Airxcel 46101-8114, Service Manual

Page: 13 / 19

NO HEAT
-13-
115 VAC To A/C Unit NO Start Generator OR Refer To
Generator Service Manual
NO
Does APU Have Auto
Generator Start?
YES
12 VDC At Thermostat Wiring
Plug At Unit Red (+) & Blue (-)
NO
Restore 12 VDC, Red (+)
Blue (-)
YES Refer To Auto Gen Checkout
YES 12 VDC At
Thermostat Wiring
Plug At Unit
12 VDC At Thermostat Wiring Plug
At Unit Gray & Blue
NO
Check Wiring And
Connections To Plug And
At Thermostat. Repair As
Needed. If All Are Good,
Replace Thermostat.
YES
12 VDC At P.C.
Board WI
NO
Check Wiring And Connections From Thermostat
Wiring Plug Gray Wire To W1. If Wiring Is
Good, Replace P.C. Board.
YES
Is Indoor Low
Speed Running?
Thermostat Set
For Low Heat
Thermostat Set
For High Heat
12 VDC At Thermostat Wiring
Plug Orange (+) & Blue (-)
NO YES
Refer To Blower
Low Checkout
12 VDC At P.C.
Board W1 & B
YES
Check Heat Elements And
Limit Switch.
NO
Check Wiring And Connectors
To Thermostat. Repair As
Needed. If All Are Good,
Replace Thermostat.
NO
Check All Wiring And
Connections From “W1”
On P.C. Board To Gray
Wire In Thermostat Wiring
YES
Check All Wires From P.C. Board To
Heat Elements. Repair As Needed. If
All Are Good, Check Limit Switch And
Heat Elements.