A draft test shows that:

a$.$ The vent is $$

b$.$ The vent is not $q,$

c$.$ We have $$ air

d$.$ The house is sealed too

If the status light is blinking:

$$

a$.$ The $$ is making proper power

b$.$ All electrical connections to the gas $$ and door $$ are good

c$.$ The heater is $$

A two flash code means the $$ oltage is low.

If the pilot is out, the water heater will display the $$ code.

Part $10$:

Direct vent water heaters receive all combustion air directly from $$

Available $$ air is a critical factor when picking a gas water heater.

Part $11$:

Venting too $q,$ could cause a $3$ flash error code.

It is important to use the proper $$ in the vent termination.

Vent temperature limit switches are a "normally $$ switch."

The trial for flame sense period on a power vent water heater is $q,$ seconds long.

Fine grade $$ s acceptable to use when cleaning a flame sensor$.$ Part $12$:

Power direct vent heaters are good for installs that do not have adequate $q,$ air.

Part $13$:

$86.$ Condensing tank type water heaters use a $$ heat $$ to reach $90$ percent efficiency.

$87.$ The purpose of a helical heat exchanger is to keep flue gases in the tank $q,$ and to betteI $$ the heat

$88.$ On a high efficiency powervent, error code $6$ means the flame was not $q,$ and the heater has $$ out.

Part $14$:

$89.$ Condensing gas water heaters are $$ than non$-$condensing gas water heaters.