Troubleshooting

Heater

PROBLEM

CAUSE

SOLUTION

 

 

 

 

 

 

 

Heat turned off.

Press A or B zone

Primary heater(s) does not heat.

 

 

keys.

 

 

 

 

 

 

Temperature control alarm.

Check temperature display for diag-

 

 

nostic code, page 9.

 

 

 

 

Signal failure from thermocouple.

See E04: Fluid Temperature Sen-

 

 

sor (FTS) or thermocouple discon-

 

 

nected, page 11.

 

 

 

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 re-plug

 

 

thermocouple wires, cleaning off any

 

 

debris. Unplug and re-plug long

 

 

green connector.

 

 

 

 

Thermocouple not contacting heater

Loosen ferrule nut (N), push in ther-

 

element.

mocouple (361) so tip (T) contacts

 

 

heater element (358). Holding ther-

 

 

mocouple tip (T) against heater ele-

 

 

ment, tighten ferrule nut (N) 1/4 turn

 

 

past tight. See page 30 for illustra-

 

 

tion.

 

 

 

 

Failed heater element.

See Primary Heater, page 28.

 

 

 

 

Signal failure from thermocouple.

See E04: Fluid Temperature Sen-

 

 

sor (FTS) or thermocouple discon-

 

 

nected, page 11.

 

 

 

 

Thermocouple wired incorrectly.

See E04: Fluid Temperature Sen-

 

 

sor (FTS) or thermocouple discon-

 

 

nected, page 11. Power up zones

 

 

one at a time and verify that tempera-

 

 

ture for each zone rises.

 

 

 

3A1570A

19

Page 19
Image 19
Graco A-25 important safety instructions Heater, See E04 Fluid Temperature Sen, Sor FTS or thermocouple discon