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_Marc's avatar
_Marc
Explorer
Sep 26, 2021

Aqua Hot 450D troubleshooting cool air zone 2 (front)

Allegro Bus 45LP 2014 Aqua hot 450D Aqua Hot cool air zone 2 (front) 1- All light are green 2- Plastic container at right level of anti-freeze when hot or cold. 3- Tap the check valve 4- Pu...
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Trainer's avatar
Trainer
Explorer
Sep 27, 2021
The 450D is run by an electronic control board, no clear relays.

The 450D has a 5 gallon coolant tank where the older heaters you mention have a 16 gallon coolant tank.

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