LINE
K1
COMB BLOWER
K5
IGNITER ELEMENT
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| K3 | K4 |
24 | ECO/VENT | PRESSURE | GAS | GAS |
VAC | SWITCH | SWITCH | VALVE | VALVE |
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| RLY 1 | RLY 2 |
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| GAS |
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| VALVE |
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| K1 |
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| CONTROL |
| K5 |
| ELECTRONICS | K3 | ||
| K4 | |||
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| CONTROL | WATER |
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| HEALTH | TEMPERATURE |
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K3 | K4 |
ECO/VENT PRESSURE |
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CONTROL HEALTH
Control Health LED Flashing
POSSIBLE CAUSE | REMEDY |
This indicates that the main | Press red reset button on the |
control board has failed one or | display board to reset the con- |
more of its internal diagnostic | trol. If this error occurs repeat- |
edly, replace the main control | |
| board. |
COMBUSTION AIR BLOCKAGE
Pressure Switch LED Flashing
LINE
K1
COMB BLOWER
K5
IGNITER ELEMENT
24 | SWITCH | GAS | GAS | |
VAC SWITCH | VALVE | VALVE | ||
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| RLY 1 | RLY 2 | |
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| GAS | |
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| VALVE | |
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| K1 | |
| CONTROL |
| K5 | |
ELECTRONICS | K3 | |||
K4 | ||||
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CONTROL | WATER |
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HEALTH | TEMPERATURE |
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POSSIBLE CAUSE
1.Combustion air blockage.
2.Blower not operating:
a.Blower wiring
b.Blower motor
3.Defective air switch
4.One of the gas valve wires- may be disconnected dur- ing ignition sequence.
REMEDY
1. Check intake and exhaust piping for obstructions.
2a. Repair wiring.
2b. Replace blower motor.
3.Replace air switch.
4.Check wires to Gas valve. Reseat wires into harness.
5. Poly hose between the | 5. Remove or correct block- |
blower and air pressure | age connect hose to blow- |
switch is blocked or discon- | er or air pressure switch. |
nected. |
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TEMPERATURE PROBE FAULT
Water Temp LED Flashing
LINE
K1
COMB BLOWER
K5
IGNITER ELEMENT
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| K3 | K4 |
24 | ECO/VENT | PRESSURE | GAS | GAS |
VAC | SWITCH | SWITCH | VALVE | VALVE |
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| RLY 1 | RLY 2 |
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| GAS |
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| VALVE |
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| K1 |
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| CONTROL |
| K5 |
| ELECTRONICS | K3 | ||
| K4 | |||
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POSSIBLE CAUSE
1.Temp probe wiring open.
2.Defective probe.
3.No water in tank or tank in freezing conditions.
4.Water level in tank is too low - probe in steam.
5.Probe wiring shorted.
REMEDY
1.Repair wiring.
2.Replace probe.
3.Control is recording an “out of bounds” condition. Turn on water supply; remove tank from freezing conditions.
4.Control is recording an “out of bounds” condition. Fill tank.
5.Replace probe.
CONTROL | WATER |
HEALTH | TEMPERATURE |
NOTE:
If the temperature probe housing fractures and allows water into the sensor section of the probe, this may affect the temperature display on the display pnael. If the display is showing highly inconsistent temperature readings, this is an indication the temperature probe is defective due to water contamination. Replace probe.
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