Troubleshooting Flowcharts
Nothing Happens
Is Overload
tripped on
starter?
NO
Is
open?
YES | Reset & measure FLA | ||
of motor. Is it higher | |||
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| than rating? | |
YES | Adjust or |
| Replace |
YES
Adjust
or
change Pulley
Blower runs but there is no heat
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| NO |
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| on Flame Saftey |
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| illuminated? |
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| airflow. | ||
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| YES |
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| Is outside air cooler than |
| NO | Proper |
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| intake air thermostat |
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| economizer |
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| setting? |
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| operation |
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NO
YES |
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Is High Temp. | ||
Limit Tripped? |
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Reset
Is end switch on | NO | Adjust or |
Motorized |
| Replace |
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Damper closed? |
| actuator |
| NO |
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Is there a | NO | ||
Remote Panel | |||
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Installed? |
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| YES |
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Is Remote set to | |||
"Heat" |
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Refer to Flame |
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Safety Guide |
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Check wiring
Set Remote
Panel to
"Manual" and "Heat" mode.
Burner lights but
heater stays in
Low Fire
| No |
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Is there voltage on | Replace | ||
Terminal #17 |
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Yes
Burner lights but heater
stays in High Fire
Is there a jumper between 
terminals 2 & 3 on the
Maxitrol Amplifier?
Yes
No
Install Jumper
Are all valves
powered and open?
Yes
With wires 3 & 4 removed from the Maxitrol Amplifier, is there 9.5K to 11K Ohms between the wires?
Yes
Remove Terminal #4
from the Maxitrol
Amplifier. Does the
heater go into High Fire?
No | Check valve wiring |
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No | Replace |
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Discharge Air |
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| Is | there a short or open | ||
No | circuit in Modulating | ||||
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| Valve? Should be | |||
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Is there a short circuit in the Remote Temperature Selector or wiring?
No
Is there an open circuit in the Discharge Air Sensor or wiring?
No
Is Plunger in the
Modulating Valve jammed?
Inspect and clean. It
should operate freely in
the sleeve.
No
Foreign object holding valve open. Remove
Yes
Yes
Repair short or
replace
Temperature
Selector
Repair Circuit or
replace the
Discharge Air
Sensor
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| Yes |
| Replace |
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| Amplifier |
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With wires 1 & 2 |
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removed from the | No | Replace the |
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Maxitrol Amplifier, is | Temperature |
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there 9.5K to 11K Ohms |
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| Selector |
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between the wires? |
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bottom plate and inspect valve and seat. Clean or replace valve.
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