Fault |
|
| Lockout |
| |
Code | Description | Cause | Remedy | ||
type | |||||
Displayed |
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| ||
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E15 |
| Blower speed is 200RPM |
|
| |
|
| below the target speed for |
|
| |
|
| 20 seconds. |
|
| |
E16 |
| Blower speed is 500RPM |
|
| |
|
| above the target speed for 6 |
|
| |
|
| seconds. | Soft | 1. Check the blower wire harness. | |
E17 | Blower speed | Machine starts or normal | |||
| 2. Change the blower. | ||||
| abnormal. | combustion, but Blower |
| ||
|
| 3. Change the board. | |||
|
| speed = 0 for last 3sec. |
| ||
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|
|
| ||
E18 |
| Have Blower’s output signal |
|
| |
|
| but the Blower speed = 0 for |
|
| |
|
| last 400ms. |
|
| |
E19 |
| Blower speed stuck > 3000 | Soft |
| |
|
| rpm |
| ||
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|
|
| ||
E20 | Proportional | Proportional valve Current < |
| 1. Check the proportional gas valve | |
| Minimum. |
| wire harness. | ||
| valve (PV) current | Soft | |||
E21 | Proportional valve Current > | 2. Change the board. | |||
| unusual. | Maximum. |
| 3. Change the gas valve assembly. | |
|
|
| |||
E22 | Outlet | Outlet Temperature |
|
| |
| Temperature | is < minimum defined |
|
| |
| Probe is Open | temperature. |
|
| |
| circuit. |
|
|
| |
E23 | Outlet | Outlet Temperature |
|
| |
| Temperature | is > maximum defined |
|
| |
| Probe is Short | temperature. |
|
| |
| circuit. |
|
|
| |
E24 | Inlet Temperature | Inlet Temperature is |
| 1. Check temperature probes wire | |
| Probe is Open | < minimum defined | Soft | harness. | |
| circuit. | temperature. | 2. Replace themperature probe. | ||
|
| ||||
E25 | Inlet Temperature | Inlet Temperature |
| 3. Change the board. | |
| Probe is Short | is > maximum defined |
|
| |
| circuit. | temperature. |
|
| |
E26 | Tank Temperature | Tank Temperature |
|
| |
| Probe is Open | is < minimum defined |
|
| |
| circuit. | temperature. |
|
| |
E27 | Tank Temperature | Tank Temperature |
|
| |
| Probe is Short | is > maximum defined |
|
| |
| circuit. | temperature. |
|
| |
E28 | Ignition failure. | After a failure to detect |
| 1. Check the igniter wire harness. | |
|
| the flame during ignition, |
| 2. Check igniter 120Vac voltage | |
|
| the control will retry the |
| supply during the ignition time. | |
|
| specified number of times. |
| 3. Check the ignition rod. If it looks | |
|
| After the maximum failed | Soft | dirty clean it using isopropyl alcohol | |
|
| attempts, this fault is |
| and a clean cloth. | |
|
| declared. |
| 4. Check the high voltage wiring | |
|
|
|
| connection between igniter and | |
|
|
|
| igniter rod for proper contact. | |
E29 | Outlet water | Outlet water temperature <= |
| 1. Check the outlet temperature probe. | |
| temperature too | (setting temperature – 15°C) | Alert | 2. Change the board. | |
| low. | for 60 seconds after flame |
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| |||
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| detected. |
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| TABLE 5 |
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www.hotwater.com | 49 |