MCZ SELECTA 15HQ S1 - User Manual

Questions and Answers

K
Karen RodriguezAug 6, 2025
What to do if pellets are not feeding into my MCZ Boiler combustion chamber?
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  davisscottAug 7, 2025
  If pellets aren't feeding into the combustion chamber of your MCZ Boiler, several issues could be the cause. First, ensure that the pellet hopper isn't empty and fill it if needed. Check for sawdust blocking the feed screw, and if present, empty the tank and manually remove the sawdust. Also, make sure that the door is properly closed and the gaskets are in good condition. If not, close the door and replace the gaskets with original ones. Finally, verify you're using the type of pellets recommended by the manufacturer; if not, change them.
Y
yzunigaAug 13, 2025
Why does my MCZ Boiler run for a few minutes and then shut off?
- C
  Cory ColeAug 13, 2025
  Your MCZ Boiler might be shutting off after a few minutes due to several reasons. It could be that the start-up phase wasn't completed, in which case you should repeat the start-up process. A temporary power cut could also be the cause; if so, wait for the automatic restart. Another potential issue is a clogged smoke duct, which requires cleaning. Also, faulty temperature probes or a faulty spark plug can cause this problem; consider checking and replacing the probes or the spark plug, if necessary.
S
Suzanne HardyAug 19, 2025
How to fix weak flame and pellet accumulation in my MCZ Boiler?
- J
  Joseph RogersAug 19, 2025
  If you're experiencing pellet accumulation in the brazier, a dirty door glass, and a weak flame in your MCZ Boiler, it could be due to insufficient combustion air. Clean the brazier, ensuring all holes are clear, and perform a general cleaning of the combustion chamber and the smoke duct. Also, check that the entry of air is not obstructed. Another potential cause is damp or unsuitable pellets, so try changing the type of pellets you're using. A faulty smoke evacuation motor can also cause this issue; check the motor and replace it if necessary.
I
ianmarquezAug 25, 2025
What to do if the smoke evacuation motor on my MCZ Boiler isn't working?
- D
  davismichaelAug 25, 2025
  If the smoke evacuation motor on your MCZ Boiler isn't working, first check if there's electrical supply to the boiler by verifying the mains voltage and the protection fuse. If the power supply is fine, the motor itself might be faulty; in that case, check the motor and capacitor, and replace them if necessary. A defective motherboard or a broken control panel could also be the cause, consider replacing the electronic board or the control panel.
C
Cynthia WilliamsAug 31, 2025
Why does my MCZ Boiler always run at full power in automatic mode?
- A
  Alexander BeltranAug 31, 2025
  If your MCZ Boiler is constantly running at full power in automatic mode, it could be because the thermostat is set to minimum; try resetting the temperature of the thermostat. Another possibility is that the room thermostat is positioned in a way that it always detects cold, so reposition the probe. A malfunctioning temperature probe or a faulty control panel could also be the cause; check these and replace them if necessary.

Summary

Pellet Boiler Installation Guide

First Start-Up Procedures

Pre-Start General Precautions

General safety precautions to be taken before the initial start-up of the boiler.

Initial Start-Up Settings Configuration

Steps for configuring settings before the first start-up of the boiler.

Pellet Loading Instructions

Instructions for manually or automatically loading pellets into the boiler.

First Start-Up Safety and User Training

Safety instructions and key elements for user handover during first start-up.

Control Panel and Menu Functions

Control Panel Overview

Overview of the control panel display and its key elements.

Main Menu Navigation

Accessing and navigating the main menu options on the control panel.

Date and Time Configuration

Step-by-step guide to configure the date and time settings on the boiler.

Programmed Mode (Timer) Setup

How to program timer functions for automatic boiler operation.

Timer Usage Notes and Sleep Function

Important notes on timer use, sleep function, and adjustments menu.

Settings Menu Options

Language and Adaptive Mode

Procedure to select language and activate adaptive mode requiring technician supervision.

Cleaning and Tones Settings

Enabling/disabling smoke extractor and audible feedback (tones).

Feed Screw Loading and External Thermostat

Function for loading pellets and connecting/enabling an external thermostat.

Auto-Eco Mode and Pump Activation

Activating Auto-Eco mode and setting pump activation temperature.

Eco Switch-off Temperature and Auto Eco Mode

Setting Eco switch-off temp and detailed explanation of Auto Eco mode.

Auxiliary Boiler, Pellet Recipe, and Fumes Ventilation

Settings for auxiliary boiler, adapting to pellet types, and adjusting fumes extraction.

Maximum Power and Component Testing

Setting maximum power and performing diagnostic tests on boiler components.

Test Performance Function

Forcing boiler operation to test performance under specific parameters.

System Configuration and Season Settings

Setting hydraulic system configuration and selecting summer/winter modes.

Technical Menu Access

Information on accessing the technical menu via service centre.

Information Menu

System Configurations Overview

Configuration 1: Factory Setting

Description and diagram for system configuration 1.

Configuration Diagrams (2 & 3)

Configuration Diagram (4)

Configuration Diagram (5)

Operating Mode and Electrical Connections

Terminal Block Contacts

Key for understanding terminal block connections on the motherboard.

Appliance Start-Up and Power Supply

Safety Devices and Alarms

Safety Devices Overview

Details of the various safety devices integrated into the boiler system.

Operational Safety Functions

Functions like anti-freeze, pump anti-seizure, and behaviour during power cuts.

Safety Device Tampering Prohibition

Boiler Stop Conditions and Reset

Conditions causing boiler stop and manual safety thermostat reset procedure.

Alarm Signalling and Solutions

Alarm A05 Triggered

Alarm Reset and Shutdown Procedures

Recommendations for Safe Use

General Safe Use Recommendations

Crucial advice on installation, maintenance, and usage for safe boiler operation.

Maintenance and Cleaning - User Tasks

Daily or Weekly User Cleaning

User-guided tasks for daily or weekly cleaning of the brazier.

Cleaning the Ash Pan

Procedure for emptying and cleaning the ash pan.

Exchanger and Brazier Compartment Cleaning

Recommended cleaning of the exchanger and compartment every 2-3 days.

Maintenance and Cleaning - Technician Tasks

Technician Cleaning: Exchanger and Upper Compartment

Technician's procedure for cleaning the heat exchanger, pipe unit, and upper compartment.

Cleaning the Smoke Extractor Compartment

Steps for accessing and cleaning the smoke extractor compartment.

Smoke Expulsion System Checks and Seasonal Shutdown

Cleaning smoke outlet system, general checks, and seasonal shutdown procedures.

Internal Component Checks by Qualified Personnel

Overview of essential checks and maintenance for internal electromechanical components.

Combustion Chamber Overpressure Discharge Replacement

Maintenance Schedules and Panel Cleaning

User vs. Technician Cleaning Schedules

Tables summarizing user and technician cleaning tasks and intervals.

Control Panel Display Cleaning

Recommendations for cleaning the boiler's control panel display.

Troubleshooting Common Anomalies

Internal Component Troubleshooting Guide

Guide for technicians on checking internal components for troubleshooting.

Pellet Feed and Boiler Operation Issues

Causes and solutions for pellet feed failures and boiler stopping.

Boiler Running and Motor Function Issues

Causes and solutions for brief operation, dirty glass, motor failures, and full power issues.

Stove Operation and Hydraulic Circuit Problems

Causes and solutions for stove non-operation and hydraulic circuit issues.

Electrical Plan and Wiring Key

Motherboard Wiring Key

Key explaining the connections on the motherboard wiring diagram.

MCZ SELECTA 15HQ S1 Specifications

General

Brand	MCZ
Model	SELECTA 15HQ S1
Category	Boiler
Language	English