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301:Enghead

overtSW

Engineheadcontroltemperaturegreaterthan540degreesC AR  C

302:Enghead

t'couplediff

Magnitudeofthedifferencebetweentheengineheadcontrolandlimitthermocouplesis

greaterthan100degreesC

UR  C

303:Enghead

t'couplecont

Engineheadcontrolthermocouplefailure UR  C

304:Enghead

t'couplelim

Engineheadlimitthermocouplefailure UR  C

305:Engunder

current

Enginecurrentlessthan0.1A,60secondsaftergridconnection SR  L

308:Stop

resistorintegrity

Thestopresisterintegritycheckhasfailed SR  M

309:Powerfail

detection

Powerfailuredetected AR  F

310:Powermon

commfail

NodatareceivedfromthepowermeterICinthelast10secondsorthepowermonitor

failedtoregisterwiththeEGCmicrocontrollerwithin10secondsofpowerup

AR  F

311:EGC

comm.failure

Communicationtimeoutorcommunicationfailure AR  F

394:EngBCU

comfail

EngineBCUcomm.failure ARP  F

395:SuppBCU

comfail

SupplementaryBCUcomm.failure  ARP F

396:Enghead

controltherm.

Engineheadcontrolthermocouplefalsereading AR  C

397:Enghead

Limittherm.

Engineheadsafetythermocouplefalsereading AR  C

398:Enghead

controlrise

Engineheadcontrolthermocoupleriseratelessthan30degCinfirstmin. AR  C

399:Enghead

Limitrise

Engineheadsafetythermocoupleriseratelessthan30degCinfirstmin AR  C

400:Flowdir

heatgen

Returntemperature>flowtemperatureforlongerthan3minutes UR UR I

421:Engbuexc

tempdiffh'ex

Engineburnerexcessivetemperaturedifferenceacrosstheheatexchanger AR  I

422:BCUEng

buinconsistent

TransmittedstateoftheengineburnerBCUisn'tconsistent AR  F

423:BCUSupp

buinconsistent

TransmittedstateofthesupplementaryburnerBCUisn'tconsistent  AR F

424:Rep.loss

offlameEngbu

Repeatedlossofflameengineburner UR  E

425:Rep.loss

offlameSupp

repeatedlossofflamesupplementaryburner  UR E

428:Boilerflow

Engbu

Flowhasbeen<7L/minformorethan30minutes AR  I

page79

17.5Exceptionalconditions

1.Inexceptionalcases,thedisplaywillshowanerrorscreenseediagrambelow.

2.Withthefollowinginformation:

Anerrornumber

Ashortdescriptionoftheerror

Thedisplaymayshowaflashingspanner,aflamecrossedoutorbothdependingontheleveloftheerror

3.PressingthemenubuttonwillreturntheTHINKControllertothestandarddisplaywhichwillnowshowthefollowingsymbol whichindicatesthatanerrororfaulthas

occurredintheappliance.After1minutethedisplaywillautomaticallyreverttotheerrorscreen.

4.Pressthemenubuttontwicetoreverttotheerrordisplayimmediately.Alistoferrorcodesisshowninsection17.4.Thislistcontainsbothuserresetandautomatic

resetcodes.Automaticcodesaregivenhereastheyarecapableofclearingautomaticallyanddonotnecessarilyindicatethataservicevisitisrequired.