Technical data

LIGHTING THE WATER HEATER
39
DIAGNOSTIC FEATURES OF HOT SURFACE IGNITION CONTROL
Warning: The removal of the access covers will expose 240 V wiring. They must only be removed by a
qualified person only.
The water heater incorporates an electronic control module. This is located inside the access cover of an
indoor model and to the right of the access cover inside the air duct on an outdoor model (refer to installation
diagrams on pages 23 and 24).
An LED light on the module will flash once when power is switched on to the water heater. In the event of a
fault occurring in or affecting the Hot Surface Ignition system, the system will enter “lock out” and the LED
will emit a series of flashes diagnosing the fault. There will be a 2 second interval between each group of
flashes.
Flashes
Fault
1
Re-ignition attempt lockout.
2
631 275 models only – Pressure switch not open.
3
631 275 models only – Pressure switch not closed.
4
Faulty igniter/igniter sensing circuit.
5
Flame sensed with gas valve de-energized.
6
Active and neutral wiring reversed.
7
Check flame sensor and/or appliance grounding.
Rapid
Frequency check failure.
Remains on
Press the reset button.*
* Note: If the LED light remains on after pressing the reset
button, the electronic control must be replaced. Phone
Rheem Service or their nearest Accredited Service Agent.
TEST THE WATER HEATER AFTER INSTALLATION
The operation of the water heater must be thoroughly checked by the installer.
The burner flame must light smoothly and quickly from the hot surface igniter and must go out quietly
and completely.
The burner flame must be stable, although slight lifting at the front edge of the burner is acceptable
when the burner is cold.
The burner flame should be blue, with a clearly defined inner cone - luminous yellow or “floating” flames
are not acceptable and must be corrected by opening the interrupter screw (refer to “Air Adjustment” on
page 40).
Check the test point pressure and compare with the rating label. Adjust if necessary.
If unable to get the water heater working properly, contact Rheem Service or their nearest Accredited
Service Agent to arrange for an inspection.
When satisfied everything is working properly instruct the user in the correct method of operation.
Removal of the front cover on the 631 275 model whilst burner is operating will lead to re-ignition lockout
(refer to “Diagnostic Features of Hot Surface Ignition Control” on page 39).
reset button
LED
indicator light