Why is my heater making a ticking/knocking noise?

The ticking/knocking sound the heater is making is the natural expansion and contraction of the metal components. This is a natural phenomenon that occurs in all metallic objects when subjected to heating and cooling cycle and can cause them to creak, tick or ping on occasion. This is not a manufacturing fault.

Applicable models

QRAD – QRAD050E, QRAD075E, QRAD100E, QRAD150E, QRAD200E, QRAD050RF, QRAD075RF, QRAD100RF, QRAD150RF, QRAD200RF

MONTEREY – MFP050E, MFP075E, MFP100E, MFP150E, MFP200E, MRP050, MFP075, MFP100, MFP150, MFP200

GIRONA – GFP050WE, GFP075WE, GFP100WE, GFP150WE, GFP200WE, GFP050BE, GFP075BE, GFP100BE, GFP150BE, GFP200BE, GFP050W, GFP075W, GFP100W, GFP150W, GFP200W, GFP050B, GFP075B, GFP100B, GFP150B, GFP200B

SALETTO – LPP050E, LPP075E, LPP100E, LPP150E

PLXE – PLX050E, PLX075E, PLX100E, PLX125E, PLX150E, PLX200E, PLXC300E, PLX050ENC, PLX075ENC, PLX100ENC, PLX125ENC, PLX150ENC, PLX200ENC

PLX – PLX500, PLX750, PLX1000, PLX1250, PLX1500, PLX2000, PLX3000, PLX500TI, PLX750TI, PLX1000TI, PLX1250TI, PLX1500TI, PLX2000TI, PLX3000TI, PLX2000TX, PLX3000TX, PLX500NC, PLX750NC, PLX1000NC, PLX1250NC, PLX1500NC, PLX2000NC

LSTE – LST050E, LST075E, LST100E, LST150E, LST050, LST075, LST100, LST150

ALTA (DTD) - DTD2R 07, DTD2R 10, DTD2R 12,    DTD2R 05, DTD4R 05, DTD4R 07, DTD4R 10, DTD4R 15, DTD4R 20

MK1E – B075E, C100E, D150E, E200E

EPX – EPX500, EPX750, EPX1000, EPX1250, EPX1500, EPX2000

EVS – EVS050, EVS075, EVS100, EVS150

EVX – EVZ050, EVX100, EVX125, EVX150, EVX200

RPX – RPX075N, RPX100N, RPX150N, RPX200N

CEPE – CEP050E, CEP075E, CEP100E, CEP150E, CEP200E, CEP500E, CEP750E, CEP1000E, CEP1500E, CEP2000E

TPRIIIE – TPRIII050E, TPRIII075E, TPRIII100E, TPRIII125E, TPRIII150E, TPRIII200E, TPRIII300E, TPRIII 500E, TPRIII 750E, TPRIII 1000E, TPRIII 1250E, TPRIII 1500E, TPRIII 2000E

TPRIII M/MT – TPRIII 500M, TPRIII 750M, TPRIII 1000M, TPRIII 1250M, TPRIII 1500M, TPRIII 2000M, TPRIII 500MT, TPRIII 750MT, TPRIII 1000MT, TPRIII 1250MT, TPRIII 1500MT, TPRIII 2000MT

TPRIII NC – TPRIII 500NC, TPRIII 750NC, TPRIII 1000NC, TPRIII 1250NC, TPRIII 1500NC, TPRIII 2000NC

CPHT – CPH05T, CPH10T, CPH15T, CPH20T, CPH24T

PPH – PPH750, PPH1000, PPH2000

EPH – EPH500, EPH1000, EPH1250, EPH1500, EPH2000

HPH – HPH750, HPH1000, HPH1250, HPH1500

BATHROOM/VERTICAL – BPH100G, BPH100M