Page 16MorrHeat - Most Heat In The Industry - Rev 1/31/2019
Troubleshooting
1. Heater shuts off
2.Lossofprime
overnight
▲Manualreset
▲Vacuumairleakinairline
▶Pluggedlterortankempty
▼Pluggedpumpscreen
▲Requiredmanualreset
▲Tightenallfuelconnections
▶Checkpumpscreen
▼Cleanlter(useventport),reprimepump
3.Fails to Start ▲Vacuumleak
▲Inadequatefuelsupply
▶Nopressure
▶Nopre-heat
▶Autostartcircuitnot
functioning
▶Noarc
▶Noairpressure
▲Openbleederportifairispresent.
▲Cleanlter.Checkallfuelconnections.Tightenttings.
▶Check,mayneedcleaning-toaccess,remove,pumpcover.
▶Useventport,andreprimepump.
▶Besureallwiringtopre-heateristight.
▶Badheatrod-replace.
▶Checkcircuitcontrolboardandreplaceifnecessary.
▶Checkcontinultyatterminalsofheatrodlimitsnapswitch.
▶Checkspringstoelectroderodadjustment(undertransformer)-make
sure they have good contanct. Open burner door and make sure electrode
tipsaren'ttouchingamecone.
▶Checkpressureregulatorandadjust.Checkairsupplylinefor
restrictions or leaks. Pull compressor cover and inspect carbon vanes.
Mayneedtoreplace.Checklter,cleanifneeded.
4. Reduced air pressure
and can’t increase
▲Gaugemaybebad.
▲Intakeltermuferisplugged
withdustordirt.
▶Exposedtowinter
▼Compressorvanesmaybe
worn
▲Replacegauge
▲Remove&cleanwithcarburetorcleaner,drythoroughly.Donotuse.
▶Removecover,cleanrustwithemerycloth
▼Replacecarbonvanes
5.Hardstarting
(Diminishedame)
▲Pariiallypluggedlter.
▶Restrictioninnozzleusually
onlywheninitiallyinstalled.New
lines may have foreign material
in them.
▶Airbandopentoofar
▼Outoffuel
▼Nooiltoburner
▲Cleanlter.Usingventport-reprimepump
▶Removenozzleandcheckforforeignobjects
▶Aluminiumblockpre-heaterinsideburnershouldnotbuildupcarbon.
If carbon present, pre-heat circuit is malfunctioning. Thermocouple heat
sensorwirecouldhaveopencircuit.Heatcontrolboardmayhaveblown
circuit and circuit board fuse. Inspect both and replace either if needed.
▶Closeairband-whileviewingame;openairbandslowlyunitl
combustion chamber a clear, not orange
▼Rellstorage
▼Cleanpumpscreen-removepumpcover.Usingventport,re-prime
pump.
Problem
Cause Suggestion
▲ Mostlikely|| ▶Lesslikely|| ▼LeastLikely