HD101-HD401 Troubleshooting
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Step 2
Step 3
Step 4
Does the main power switch provide | NO |
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power to the green power LED? |
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| and/or line voltage | |||||
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| Is Disable connection intact? | NO | Reattach. | |||
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Is there a Call For Heat? |
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| Is temperature controller | NO | |||
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YES |
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Does the Pump come on? | NO | Is there 120VAC at the pump or | NO | |||||
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YES |
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Does the combustion air |
| NO | Is there120 VAC at the blower, | NO | ||||
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| between the red & white leads? |
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blower come on? |
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| NO | Check safeties, I.E. Flow switch, high |
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YES |
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| limit, vent switch, thermostat, etc. |
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Install.
Check and correct power
connections at main terminal block, circuit breaker panel or pump relay.
Check and correct power
connections at main terminal block, ignition module, circuit breaker panel or blower relay.
Step 5
Step 6
Step 7
Is 24VAC at the NO side of | NO |
the air pressure switch? |
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YES |
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Is 24VAC at PS on ignition module?
Is connecting plug secure?
YES
Does igniter prove? | NO |
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Is blower pressure setting correct? Should be about 0.5” W.C. (low speed)
YES
Replace low air pressure switch.
NOCorrect wiring.
Is Amp draw during heat- | NO | |
up for HSI greater than | ||
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3.1 Amps? |
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NO | Correct the blower | |
shutter setting. | ||
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NO
Is the air filter or
air intake blocked?
YES
Remove blockage and/or replace filter
Replace HSI
YES |
YES |
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Is air switch bouncing? |
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Step 8
Step 9
Step 10
Is the flame sensor signal to the ignition | NO | Is inlet gas supply pressure |
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| NO | Correct inlet gas supply pressure | |||||||||||
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module greater than 1 Micro Amp (µA) DC? |
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YES |
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| YES |
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| NO |
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| Adjust manifold gas | |||
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| pressure. | |
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| Is manifold gas | Yes |
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| pressure correct? | Replace gas valve |
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Does the unit run longer |
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than 10 seconds? |
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| YES |
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| Does the unit run at least | YES |
| Does the air pressure |
| Replace high air pressure switch | |||||||||
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YES |
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| 5 seconds? |
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| reach 0.9” W.C.? |
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| Is the air filter or air | NO | Replace blower | ||||
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| Is the polarity of incoming |
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The unit is okay |
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| intake blocked? |
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| power supply correct? |
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| YES |
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| NO |
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| YES |
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| Remove blockage | |
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| Correct supply wiring |
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| and/or replace filter | ||
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| Is sensor |
| probe grounded? |
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| NO |
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| YES | Replace Sensor | ||||||
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