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POSSIBLE CAUSE
1. Burner ground wire broken
or corroded.
2. Connectors unplugged.
3. Flame probe faulty.
4. Gas shut off.
5. Clogged gas valve.
6. Faulty gas valve.
7. Defective control.
8. Burner improperly adjusted.
9. Dirty burner.
10. Improper line connection.
11. Insufficient flame current.
REMEDY
1. Check wire and connection
at burner.
2. Check connectors.
3. Replace flame probe.
4. Turn on gas supply
5. Replace gas valve.
6. Replace gas valve.
7. Replace control.
8. Adjust burner.
9. Clean burner.
10. Verify green LED on the-
control board is illuminated
when power is applied.
11. Montior flame current.
See note below.
IGNITION LOCKOUT
Gas Valve LED Flashing
NOTE:
The flame current (flame rectification) is monitored by pressing
the blue button to the left of the LEDs during the heat cycle or
when the gas valve LED is illuminated. The 3-segment LED
display will show the actual flame curent. The expected flame
current draw is 4.0 to 5.1 micro-amps.
This condition results from a failure to establish burner ignition
after three successive trials. In such cases:
First - Investigate the possible cause and remedy any
observations.
Second - Momentarily press the red button on the display panel
to reset the lockout condition.
Third - Confirm the proper appliance operation.
POSSIBLE CAUSE
1. Temperature probe is
unplugged.
2. Temperature probe wiring
damaged.
3. Water in tank is too hot.
ECO is tripped.
4. Low water cutoff device is
tripped.
REMEDY
1. Check connectors.
2. Repair wiring.
3. Normal condition when
water temperature exceeds
safety limit. Alow tank to cool
or admit cold water into tank.
Manually reset the control.
Determine cause for overtemp
condition.
4. Make sure tank is full of
water.
ECO SWITCH OPEN
ECO LED Flashing
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS
LINE
K1
COMB
BLOWER
K5
IGNITER
ELEMENT
24
VAC
ECO/VENT
SWITCH
SWITCH
PRESSURE
GAS
VALVE
RLY 1
GAS
VALVE
RLY 2
GAS
VALVE
CONTROL
HEALTH
WATER
TEMPERATURE
K1
K5
K3
K4
K4K3
CONTROL
ELECTRONICS