Paloma PH-28RIFSN, Engineering Handbook

Page: 23 / 68

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Hints For Diagnosis
* Always inspect water heater by referring to the previous chapter "Operation System & Diagnostic
Points" and/or the Operational Flow Chart.
* When measuring resistance of a part, turn off the electric power and make sure to disconnect the part
completely before measuring (from connector or terminal).
* When measuring voltage, set the tester on the measurement point before electrified.
A. The ON/OFF Indicator (Green) on remote control does not light even if the Power Button is
turned on.
NO
*1 Measure the voltage at the wires inside of junction box.
Between Black and White wires: 108 ~ 132 VAC
YES
Replace Burner Control
Assy.
NO
Is the
fuse (3A x 2) &
(5A on PCB) OK
*2
*2 (3A x 2 Fuse): Measure the
voltage of connectors .
Between both Red wires: 90 ~ 110 VAC
(5A Fuse): Check with eyes.
CAUTION: When performing maintenance and/or servicing the water heater, turn off the electric
power, gas shutoff valve and water shutoff valve. Wait for the water heater to
become cool. Be careful to avoid injury to your fingers.
WARNING: Shock hazard line voltage is present. Before servicing the water heater, turn off the
electric power to the water heater at the main disconnect or circuit breaker. Failure
to do so could result in severe personal injury or death.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can
cause improper and dangerous operation. Verify correct operation after servicing.
* When performing maintenance and/or servicing the water heater without front cover (opened), operate
it by pushing the air filter switch (ON). Without pushing it (OFF), Error Code [21] is displayed.
(Indoor Model Only)
Is the
power cord
plugged in?
Make sure that the power
cord is correctly and firmly
plugged in.
Make sure the hardwiring
is connected properly.
Is the
voltage normal
*1
Check the breaker or
wiring in the house for
sufficient voltage.
The
maintenance
information can be
displayed?
Replace Remote
Control.
Replace Fuse (3A x 2).
Replace Fuse (5A) on PCB.
OR
Is the
hardwiring
connected
properly?
YES
NO
NO
YES
YES YES
I
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