Harman PF-120 - Comprehensive Troubleshooting Guide

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1423
3-90-08120c
Withproper installation, operation, and maintenanceyour appliance will provideyears of trouble-free service. Ifyou do
experienceaproblem,thistroubleshootingguidewillassistaqualiedservicepersoninthediagnosisofaproblemandthe
correctiveactiontobetaken.Thistroubleshootingguidecanonlybeusedbyaqualiedservicetechnician.
HELPFUL HINTS
1. Cleaning Burn Pot
Wheneveryourfurnaceisnotburning,taketheopportunity
toscrapetheburnpottoremovecarbonbuildup.Avacuum
cleanerishandytoremovetheresidue.Besurethefurnace
iscoldifyouuseavacuum.
Carbonbuildupcanbescrapedloosewiththereburning
usingthespecialtoolprovidedwithyourfurnace.Scrapethe
oorandsidesoftheburnpot.Thecarbonwillbepushedout
bytheincomingfuel.Alwayswearglovestodothis.
2. Removing Ashes
TurntheTempDialtonumber1approximately30minutes
beforeremovingashes.Thiswillresultinacoolerfurnace
andashpan.
Maximum FeedAdjuster settings are not needed in most
cases.Operatinginthenormalrange(#4)isrecommended
whenmaximumheatoutputisnotrequired.TheESPprobe
preventsthefurnacefrombeingover-red.
Keepthefurnacefreeofdustanddirt.
FURNACE DOES NOT FEED
1. Nofuelinhopper.
2. Fireboxdraftmaybetoolowforsensingswitchinfeeder
circuit to operate. Check for closed doors, loose or
missinggasketondoorsorhopperlid.
3. FeedmotorwillnotrununtiltheESPcontrolsensesa
certaintemperature.Maybeyoudidnotputenoughfuel
orstartinggelintheburnpotbeforemanuallylighting
there.
4. Restrictioninthehopperorfeeder.Removeallfueland
examine.Cleartheobstruction.
5. Feedmotorhasfailed.
PARTIALLY BURNED PELLETS
1. Feedratetoohigh.
2. Poorairtofuelmixture.(Checkburnpotclean-outcover
andairintake).
3. Burn pot or heat exchanger tubes may need to be
cleaned.
4. Combinationofalltheabove.
5. #6statusblink:A6blinkcontrolboardstatusindication
iscausedbypoororincompletecombustion.Thecircuit
boardhastheabilitytotrackthecombustionthroughfeed
settingsandESPtemperatures.Whenthecontrolboard
hascalculatedpoororincompletecombustion,itwillshut
downtheunitasasafetyfeature.(Poororincomplete
combustionisacontributorofcreosotewhichmaycause
achimneyre)
A 2 blink status may be caused by several things:
1. Blockedorpartiallyblockedue.
2. Blockedorpartiallyblockedinletair.
a. Backdraft damper on the inlet pipe maybe stuck
closed.
b. If outside air is installed, the inlet cover may be
blocked.
3. Theairchamber undertheburnpot maybelled with
nesandsmallbitsofash.
4. Theholesintheburnpotmaybegettinglledwithash
orcarbonbuildup.
5. Combustionblowerfanbladesmayneedcleaned.
6. Fuelrestrictionsasnotedabove.
SMOKE SMELL
Seal the vent pipe joints and connection to furnace with
silicone.Theexhaustventistheonlypartofthesystemthat
isunderpositivepressure.
FIRE HAS GONE OUT- Check for status light.
1. Nofuelinhopper.
2. Draftistoolow,blockedue.
3. Somethingisrestrictingfuelow.
4. Hopperlidnotclosedproperly.
5. Feedmotororcombustionblowerhasfailed.
SMOKE IS VISIBLE COMING OUT OF VENT
1.Air-fuelratioistoorich.
a.Feedratetoohigh.
b.Drafttoolowcausedbyagasketleak.
LOW HEAT OUTPUT
1. Feedratetoolow
2. Drafttoolowbecauseofgasketleak.
3. Poorqualityordamppellets
4. Combinationof1and2.
Fuel
ThePF-120PelletFurnaceisapprovedforburninganygrade
ofpelletizedbio-massfuel.
It should be noted, however, that higher ash content will
requiremorefrequentashremoval,scrapingoftheburnpot,
andmayprovidelessBTU'sperpound.
Themoisturecontentofpelletsmustnotexceed8%.Higher
moisturewillrobBTU'sandmaynotburnproperly.
Fuel shouldnot be storedwithin the furnace installation
clearances orwithin the space required forcharging and
ashremoval.
C. Troubleshooting