Rheem Commercial Power Direct Vent Water heater installation instructions Ignition Led

“System Sentinel”Troubleshooting Guide

Section 3... the “IGNITION” LED

NO

Is the Ignition LED Illuminated?

YES

Is Spark Ignitor operating?

The Thermostat has called for

Is the Blower

Operating?

YES

heat, the Blower is running, and

(Can sparking

be heard?)

24 VAC power is being supplied to

NO

the Ignition Control Module and

YES

the ignition sequence will begin.

NO

Is there 120 VAC

The System Sentinel Panel is

across Black wire

NO

defective and must be replaced.

and White wire of

blower?

Is 24 VAC present between the

Gray ground wire and the Red

Is there 24 VAC present

YES

24 V wire connected to the Igni-

NO

between the common and

Is

there 120

tion Control Module?

Normally open terminal of

VAC

between

pressure switch 1?

Blower

is

the black wire at

YES

defective

the relay and the

and must be

white wire on the

YES

replaced.

transformer?

1. Remove Ignition Cable and check for

NO

NO

YES

good continuity, replace if necessary.

2. Check Ignitor Electrode(s) gap for proper

Check Con-

spacing (1/8” to 5/32”). Correct if neces-

tinuity of the

sary.

Check con-

Red wire from

3. Examine Ceramic Insulator on Pilot

Check continuity

the

Ignition

Check continuity

tinuity

of

Assembly for cracks. Replace if cracks

of black wire to

Module to

of black wire from

are evident.

yellow wires

the Pressure

YES

relay.

relay to blower

to pressure

Switch.

Is continuity

motor and white

If all of the above components check okay,

s w i t c h e s

wire to motor.

replace Ignition Control Module.

and between

Is continuity

good?

switches.

Is continuity

good?

Pressure Switch

Is continuity

C h e c k

NO

good?

wire con-

is defective and

YES

good?

must be replaced.

nections.

W i r e

YES

NO

NO

YES

is

defec-

Is there 120 VAC between the

tive and

must

be

black wire on the relay (power

replaced.

going to blower) and the white

Wiring harness is defec-

wire of the transformer?

tive and must be replaced.

NO

YES

Relay is		Is 24		Recheck all connections,
				should have power at blower motor.
d e fe c t i v e	YES	VAC present
and must be		across coil
					Review pressure switch circuit
replaced.		of relay?	NO
					on this page.

P o w e r should be at 24 VAC of Ignition Module.

!CAUTION

Label all wires prior to disconnection when servicing controls.Wiring errors can cause improper and dangerous operation. VERIFY PROP-

ER OPERATION AFTER SERVICING!

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