
Troubleshooting
Heater
PROBLEM | CAUSE | SOLUTION |
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| Heat turned off. | Press A or B zone |
Primary heater(s) does not heat. |
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| keys. | |
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| Temperature control alarm. | Check temperature display for diag- |
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| nostic code, page 9. |
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| Signal failure from thermocouple. | See E04: Fluid Temperature Sen- |
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| sor (FTS) or thermocouple discon- |
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| nected, page 11. |
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Control of primary heat is abnormal; | Dirty thermocouple connections. | Examine connection of thermocou- |
high temperature overshoots or E01 |
| ples to long green plug on heater |
error occurs intermittently. |
| control board. Unplug and |
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| thermocouple wires, cleaning off any |
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| debris. Unplug and |
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| green connector. |
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| Thermocouple not contacting heater | Loosen ferrule nut (N), push in ther- |
| element. | mocouple (361) so tip (T) contacts |
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| heater element (358). Holding ther- |
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| mocouple tip (T) against heater ele- |
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| ment, tighten ferrule nut (N) 1/4 turn |
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| past tight. See page 30 for illustra- |
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| tion. |
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| Failed heater element. | See Primary Heater, page 28. |
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| Signal failure from thermocouple. | See E04: Fluid Temperature Sen- |
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| sor (FTS) or thermocouple discon- |
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| nected, page 11. |
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| Thermocouple wired incorrectly. | See E04: Fluid Temperature Sen- |
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| sor (FTS) or thermocouple discon- |
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| nected, page 11. Power up zones |
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| one at a time and verify that tempera- |
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| ture for each zone rises. |
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3A1570A | 19 |