Control Logic - Flow Chart - Rheem P-M206 Instructions Manual

CONTROL LOGIC - FLOW CHART

Power On
Is the water
temperature displayed?
YES
Push MODE
switch to select
"Pool" or "Spa"
Push Temp
arrow to scroll to
desired temperature
Water temperature
and set
temperature
displayed?
YES
"Heating" will
display briefly
"Spark"
Flame icon displayed
and flashing?
OR
Water temp displayed?
(pilot lit and rectified)
YES
Heater Fired?
YES
END
• Check On/Off switch (under lid on control panel)
• Check for 120/240 volts to the transformer
NO
(time clock, circuit breaker, wire connections)
• Check for 24 volts to Circuit Board (P6 connector)
remote function off. See page 36 for instructions.
NO
"Sensor Failure," "Sensor Open" or "Sensor Short" -
Temperature sensor out of range (replace sensor)
Inspect thermister, wires, and connector at Terminal P1
Check resistance value of the thermister. Reference to chart below.
Replace thermister if not within 10% of values shown below.
If okay, replace Circuit Board.
Temp Degrees F 40
Resistance (k)
If okay, replace Circuit Board
"Water Sw Open"
"Hi Limit 1 Fault"
"Hi Limit 2 Fault"
"Rollout Sw Open"
"Clock/Fireman Sw"
"Vent/Field Sw #1"
NO
"Ignition Lockout"
"Ignition Failure"
Verify power at MV on P-4 Terminal on digital circuit board.
NO
Verify power to valve MV voltage. (Replace valve.)
"Remote" and Water Temperature displayed
(a remote control is controlling the heater)
Note: Disconnect the remote by turning the
NO
Is a fault code displayed and flashing?
YES
Diagnostic Readouts
Sensor Failure
Sensor resistance at various temperatures
50 60 70
261.1 199.0 153.1 118.8 93.0 73.3
Pressure switch. Verify water flow and pressure
CLEAN FILTER / STRAINER - backwash if neccessary.
High limit switch. Verify water flow. Inspect internal
Thermostat (Unitherm Governor) and bypass valve.
Rollout Sensor - Check for blocked heat exchanger and soot.
Atmospheric Units - Replace fusible link.
Lo NOx Units - Press manual reset button.
Fireman or Remote switch connected to safety loop is in the
OFF mode.
Vent switch open. Check connections to the board.
If extractor installed, troubleshoot extractor.
Ignition lockout. Check power at pilot valve. Check spark (bad
ignition circuit or hi-tension wire). Verify clean pilot orifice and
clearance from igniter to ground hood.
Ignition failure. Verify gas to the heater. Verify valve operation
(gas present at tube fitting).
46
80 90 100 106
58.3 51.0