Troubleshooting

Troubleshooting

Primary Heating System

Before performing any troubleshooting procedures:

1. Relieve pressure, page 5.

2. Turn OFF red main power disconnect.

3. Allow equipment to cool.

Heating Rod

Thermostat Leads

Housing

2/54

 







 

 

 



 



 



²&



Thermal Limit Switch

FIG. 1: Primary Heating System

(For complete Electrical Schematic, see page 27)

Problems

Try the recommended solutions in the order given for each problem to avoid unnecessary repairs. Also, determine that all circuit breakers, switches, and controls are properly set and wiring is correct before assuming there is a problem.

Problem

Solution

 

 

 

 

No heat, amber pilot light does not

1

cycle on.

 

 

 

Partial heat, amber pilot light on

2

continuously

 

 

 

Solutions

1.The Thermostat or Thermal Limit Switch is not functioning properly.

a.Thermostat Check - The amber pilot light will only be on when the temperature of the primary

heater is below the temperature setting of the thermostat. Turn the thermostat up (clockwise) to check the operation of the heater and then reset to the desired setting. If this does not solve the problem, continue to Step b.

b.Thermal Limit Switch. When moving the unit, it is possible that the thermal limit switch may trip in transit. If this happens, reset the limit switch and monitor the operation of the heater to ensure the switch has not tripped as a result of a heater malfunction.

To reset the Thermal Limit Switch:

1b. Turn OFF the main switch and primary heater circuit breaker.

2.Turn OFF and lock out power at the source.

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Graco 288400 important safety instructions Troubleshooting, Primary Heating System, Problems, Solutions, Problem Solution
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288400 specifications

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