MTD ERV 350, ERV 365 manual Malfunctions or Problems without Indications

4

4.7.3 Malfunctions (or Problems) without Indications

This section gives an overview of the malfunctions (or problems) that are not displayed on the CC Ease display.

Problem/Malfunction	Cause		Check / measure
All OFF	Supply voltage		Check the fuse on the PCB panel.
			• If the fuse is OK, the circuit board is defec-
				tive.
	No supply voltage		The mains power supply has failed.
High air delivery tem-	Bypass remains closed		Lower
perature in summer			the comfort temperature.
Low air delivery tem-	Bypass remains open		Increase
perature in winter			the comfort temperature.
No or insufficient air	Filter clogged		Replace
supply, shower re-			the filters.
mains wet	Valves clogged		Clean
			the valves.
	Heat exchanger clogged by dirt.		Clean
			the heat exchanger.
	Heat exchanger frozen		Thaw
			the heat exchanger.
	Fan dirty		Clean
			the fan.
	Ventilation ducts clogged		Clean
	MTD-ERV 350 in frost mode		the ventilation ducts.
Too noisy	Fan bearings defective		Replace
			the fan bearings.
	Fan settings		Change
			the ventilation control settings.
	Scraping noise		Install
	•	Siphon is empty	the siphon again.
	• Siphon does not seal
	Whistling noise		Seal
	•	An air leak somewhere in the system	the air leak.
	Air flow noises		Install
	•	Valves do not seal against duct.	the valves again.
	•	Valves not sufficiently open	Set
			the valves again.
Leaking condensation	Condensation drain clogged		Clean
			the condensation drain.
	Condensationfromexhaustductdoesnot		Check whether
	run into drain plate		the connections are correct.
Wired 3-position	Wiring is not OK		Check the circuitry of the 3-position switch
switch does not func-	Switch is defective		using a voltmeter:
tion			•	Voltage only on N & L3:
				[The fans run at position 1].
			•	Voltage only on N & L3 & L2:
				[The fans run at position 2].
			• Voltage only on N & L3 & L1 or N & L3 & L2
				& L1:
				[The fans run at position 3].
Wireless 3-position	Battery is discharged		Check
switch does not func-			the battery.
tion			•	Replace the battery, if necessary.

Instructions for the Installer 43