Display Flashes “05” when button is pressed:
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| Possible Cause | Remedy |
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| 1. | Temperature Probe wiring | 1. Repair Wiring |
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| open |
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| 2. | Defective probe | 2. Replace probe |
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Display Flashes “15” when button is pressed:
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| Possible Cause | Remedy |
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| 1. | No water in tank and tank | 1. The symptom does not |
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| in freezing conditions | reflect a control problem |
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| 2. | Water in tank above freezing | 2. Temperature probe out of |
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| tolerance, replace temp. |
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| probe |
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Display Flashes “25” when button is pressed:
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| Possible Cause | Remedy |
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| 1. | Water in tank is low, probe | 1. Fill tank |
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| immersed in steam |
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| 2. | Probe wiring shorted | 2. Repair wiring |
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| 3. | Defective probe | 3. Replace probe |
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ECO SWITCH OPEN (Figure 22)
ECO LED Flashing:
ECO SWITCH OPEN, ECO LED Flashing
FIGURE 22
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| Possible Cause | Remedy |
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| 1. This indicates the control has | 1. Press button on the |
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| failed on of its internal | display board to reset |
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| diagnostic | control. If this error |
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| occurs repeatedly, |
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| replace control. |
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CONTROL BAD (Figure 23) |
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All LEDs Flashing: |
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CONTROL BAD, All LEDs Flashing
FIGURE 23
| Possible Cause | Remedy |
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1. | Temp. Probe unplugged | 1. Check connectors |
2. | Temp. probe wiring damaged | 2. Repair wiring |
3. | Water in tank too hot | 3. Normal condition when |
water t e m p e r a t u r e exceeds safety limit. Allow water to cool or admit water into tank and manually reset the control. Determine cause for overtemp condition.
COMBUSTION AIR BLOCKAGE (Figure 24)
Pressure Switch LED Flashing:
COMBUSTION AIR BLOCKAGE, Pressure Switch LED Flashing
FIGURE 24
Possible Cause |
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1. | Combustion air blocked | 1. | Check exhaust piping and |
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| flue for obstructions |
2. | Blower not operating: | 2. | a. Repair wiring |
| a. Check blower wiring |
| b. Replace blower motor |
| b. Check blower motor |
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3. | Defective air switch | 3. | Replace air switch |
4. | Pressure switch jumped out | 4. | This controller must sense |
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| an open contact on the |
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| blower proving airflow |
switch before the blower comes on. Check to see if blower proving airflow switch is still connected to the unit.
17
