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120 volt exposure. To avoid personal injury,
use caution while performing this procedure.
Condition:
Pilot will not light,
Ignition module LED is "ON"
Reset heater by turning power
"OFF". Wait 5 seconds and turn
power "ON". When LED of
ignition module turns "ON" does
ignition module send "spartk"
signal (buzzing or clicking sound)
Y
Is there spark at the
pilot?
Y
Is there 22-27 volts AC output across
terminals "MV/PV" & "PV" of Ignition
Module? Disconnect wires & check
across terminal of module.
(see photo 11)
Y
Is there 22-27 volts AC input
across wire leads
"MV/PV" & "PV"
at Gas Valve?
(see photo 12)
N
Check continuity across ECO
(RED) leads of lower thermister
(see photo 13)
Is continuity okay?
Y
Check wire harness for damage
or loose connections. Repair or
replace as needed.
8
DANGER
N
Replace ignition
module
Check for:
Loose or damaged ignition wire
N
Grounded pilot electrode
Damaged pilot.
N
Replace ignition
module
Loosen pilot tubing connection at
Y
the gas valve and soap test.
Is there pilot gas flow out of the
gas valve?
N
Tighten pilot tube connection at
the gas valve. Check incoming
gas pressure to water heater. if
okay, replace gas valve
ECO Specifications
N
Opens between 181°F/201°F
Closes between 160°F/100°F
SERVICE PROCEDURE D24-II
CAUTION
Be Careful When Making Voltage
Measurements or Jumping Terminals
Not to Damage or Deform Connectors or
Connector Pins.
11
12
Check for clogged or kinked
Y
pilot tube, clogged pilot orifice.
Clean or replace as needed.
(see page 13)
13
Page 8
Pilot Operation Testing
Check across
"MV/PV" & "PV"
terminals
Check across "MV/PV"
& "PV" Wire leads to
gas valve
Check across RED
wire leads of lower
thermister (ECO).
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