Troubleshooting
22 3A1570V
Heater
PROBLEM CAUSE SOLUTION
Primary heater(s) does not heat. Heat turned off.
Press or zone
keys.
Temperature control alarm. Check temperature display for diagnostic
code. See Temperature Control
Diagnostic Codes, page 11.
Signal failure from thermocouple. See E04: Fluid Temperature Sensor
(FTS) or thermocouple disconnected,
page 13.
Control of primary heat is abnormal; high
temperature overshoots or E01 error
occurs intermittently.
Dirty thermocouple connections. Examine connection of thermocouples to
long green plug on heater control board.
Unplug and re-plug thermocouple wires,
cleaning off any debris. Unplug and
re-plug long green connector.
Thermocouple not contacting heater
element.
Loosen ferrule nut (N), push in
thermocouple (361) so tip (T) contacts
heater element (358). Holding
thermocouple tip (T) against heater
element, tighten ferrule nut (N) 1/4 turn
past tight. See page 33 for illustration.
Failed heater element. See Primary Heater, page 31.
Signal failure from thermocouple. See E04: Fluid Temperature Sensor
(FTS) or thermocouple disconnected,
page 13.
Thermocouple wired incorrectly. See E04: Fluid Temperature Sensor
(FTS) or thermocouple disconnected,
page 13. Power up zones one at a time
and verify that temperature for each zone
rises.
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